true or false: a scientist is examining two fossilized skeletons of what he believes are extinct whales. both have: tail bones, teeth, and front limbs. however, one has very small back legs the other has very long back legs. he is using the evolutionary species concept to identify them as two different species.
Answers
True . A scientist is examining two fossilized skeletons of what he believes are extinct Whales. both have: tail bones, teeth, and front limbs. however, one has very small back legs the other has very long back legs. he is using the evolutionary species concept to identify them as two different species.
Whales not required to maintain the body mass in the water, the skeleton is light and basic. The fatty marrow in the spongy bones, which are coated in a thin coating of compact bone, formerly made up a third of the whale's oil production.The flippers in whale skeletons feature homologous bones (humerus, radius, ulna, and phalanges organised in digits) found in other animals, including humans, as shown in this Blainville's beaked whale (Mesoplodon densirostris). This dwarf sperm whale (Kogia sima) skeleton only displays the lower jaw's teeth and the structure of the pectoral fin (flipper).
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Related Questions
7. Which of the following is not an example of an abiotic factor?
O Water
O Soil
O Disease
O Air
Please help
Answers
Answer:
Disease
Explanation:
Water, Soil and Air are all biotic except for disease.
4. In horses, black color (B) is dominant over chestnut color (b). In a Punnett
square, show the cross between two hybrid black horses.
B
Answers
Answer:
The cross between two hybrid black horses would produce three black and one chestnut horse, shown in a Punnett square as required.
Explanation:
According to the question, the coat color in horses follows Mendelian inheritance, where the gene for black coat color (denoted by B) is dominant over the gene for chestnut coat color (denoted by b). Thus, for a horse to have a black coat color, either of the two genotypes may be possible : (i) BB and (ii) Bb.Bb is termed heterozygous or may be referred to as hybrid black. However, to have a chestnut coat color, the horse must have the genotype bb.How to make a Punnett square to determine the cross between two hybrid black horses?
To make the Punnett square, we must know the gametes produced by the two parent individuals. Here, both parents are hybrid black (Bb). So each of the two parents will produce two types of gametes --- one bearing the gene for black coat color (B) and the other bearing the gene for chestnut coat color (b).These gametes are then placed in a Punnett square and all possible gamete combinations are obtained. Here, since two gametes from each parent are involved, so the number of possible combinations = 2² = 4. These combinations are : BB ---- True black/ homozygous black Bb ---- Hybrid black/ Heterozygous blackBb --- Hybrid black/ Heterozygous blackbb ---- chestnut Therefore, phenotypic ratio = Black : Chestnut = 3 : 1And genotypic ratio = BB : Bb : bb = 1 : 2 : 1.
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how does calcitonin hormone decrease the concentrations of calcium in the blood
Answers
Answer:
It inhibits the activity of osteoclasts, which are the cells responsible for breaking down bone.
Answer:
Calcitonin reduces calcium levels in the blood by two main mechanisms: It inhibits the activity of osteoclasts, which are the cells responsible for breaking down bone.
Muscles can be classified by their shape and fascicle orientation. Which shape has the muscle fibers that run the length of the muscle and taper at each end
Answers
The muscle shape that has the muscle fibers that run the length of the muscle and taper at each end is spindle-shaped (fusiform).
A spindle-shaped muscle is wider in the middle and tapered towards both ends, similar to a spindle shape. These muscles are often arranged in parallel bundles and, due to their shape, can generate a lot of force over a short distance of contraction.
A muscle's fascicle orientation refers to the way its fascicles are arranged. Fascicles are bundles of muscle fibers that make up a muscle. They're grouped together in different ways, and this grouping determines the muscle's shape and function.
The different shapes of muscles include circular, convergent, parallel, pennate, and spindle-shaped (fusiform) muscles. The orientation of fascicles in each shape differs.
In circular muscles, for example, fascicles are arranged in a circular manner around an opening or a recess, whereas in parallel muscles, fascicles are parallel to one another, resembling a strap or a ribbon. Pennate muscles, on the other hand, have fascicles that are arranged obliquely, resembling a feather.
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Dipole moment potential is given by
-μzB
μzB
-μz
-μB
again fre e points
Answers
Thanks
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FEMALE REPRODUCTIVE SYSTEM QUESTIONS: 1. Describe and give the functions of the different structures of the female reproductive system. 2. Name the hormones produced by the ovaries. Give their actions. 3. Explain briefly the phases of menstrual cycle. 4. Define: a. Menopause b. Mastectomy c. Salpingitis d. Ectopic pregnancy e. Hysterectomy f. Amenorrhea g. Dilatation and curettage
Answers
The female reproductive system is made up of the following structures; Ovaries, Fallopian tubes, Uterus, Cervix and Vagina.
What are the functions?Ovaries: The ovaries are two small, oval-shaped organs located in the pelvis. The ovaries produce eggs (ova) and hormones, including estrogen and progesterone.
Fallopian tubes: The fallopian tubes are two narrow tubes that connect the ovaries to the uterus. The fallopian tubes allow the eggs to travel from the ovaries to the uterus.
Uterus: The uterus is a muscular organ that is located in the pelvis. The uterus is where a fetus grows during pregnancy.
Cervix: The cervix is the narrow opening at the bottom of the uterus. The cervix connects the uterus to the vagina.
Vagina: The vagina is a muscular tube that connects the cervix to the outside of the body. The vagina is used for sexual intercourse and childbirth.
The functions of the female reproductive system include:
Producing eggs: The ovaries produce eggs (ova) on a monthly basis.
Producing hormones: The ovaries produce hormones, including estrogen and progesterone. Estrogen and progesterone are responsible for the development of secondary sex characteristics, such as breasts and hips, and for the regulation of the menstrual cycle.
Providing a place for a fetus to grow: The uterus provides a safe place for a fetus to grow during pregnancy.
Giving birth: The vagina is used for childbirth.
2. The ovaries produce the following hormones:
Estrogen: Estrogen is a hormone that is responsible for the development of secondary sex characteristics, such as breasts and hips, and for the regulation of the menstrual cycle.Progesterone: Progesterone is a hormone that prepares the uterus for pregnancy.3. The menstrual cycle is a monthly cycle of changes in the female reproductive system. The menstrual cycle is divided into four phases:
Menstruation: Menstruation is the shedding of the lining of the uterus. Menstruation usually lasts for 3-7 days.Follicular phase: The follicular phase is the phase of the menstrual cycle that begins after menstruation and ends with ovulation. During the follicular phase, an egg (ovum) matures in one of the ovaries.Ovulation: Ovulation is the release of an egg from an ovary. Ovulation usually occurs 14 days before the next menstrual period begins.Luteal phase: The luteal phase is the phase of the menstrual cycle that begins after ovulation and ends with menstruation. During the luteal phase, the ovary produces progesterone, which prepares the uterus for pregnancy.4. Definitions:
a. Menopause: Menopause is the natural cessation of menstruation. Menopause usually occurs between the ages of 45 and 55.
b. Mastectomy: Mastectomy is the surgical removal of one or both breasts. Mastectomy is often performed as a treatment for breast cancer.
c. Salpingitis: Salpingitis is an inflammation of the fallopian tubes. Salpingitis is often caused by a sexually transmitted infection (STI).
d. Ectopic pregnancy: Ectopic pregnancy is a pregnancy that occurs outside of the uterus. Ectopic pregnancies are often life-threatening.
e. Hysterectomy: Hysterectomy is the surgical removal of the uterus. Hysterectomy is often performed as a treatment for uterine fibroids, endometriosis, or heavy menstrual bleeding.
f. Amenorrhea: Amenorrhea is the absence of menstruation. Amenorrhea can be caused by a variety of factors, including pregnancy, menopause, and hormonal imbalances.
g. Dilatation and curettage (D&C): D&C is a medical procedure that is used to remove tissue from the uterus. D&C is often performed to diagnose or treat a medical condition, such as an abnormal uterine bleeding.
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Does stomach lining, liver, skin repair itself the fastest
Answers
The stomach lining is able to heal itself the fastest, followed by the skin, and then the liver.
What do you mean by the stomach lining?
The stomach lining is the innermost layer of the stomach, made up of cells that produce digestive enzymes and secretions that help break down food. This layer also helps protect the stomach from the acidic environment within the stomach.
The stomach lining is able to heal itself quickly because it contains specialized cells that can quickly make new tissue to replace damaged cells. The skin is also able to heal quickly because it is made up of many layers of cells that can quickly reproduce to form new skin. The liver is able to regenerate itself, but it takes longer than the stomach lining or skin because the liver is made up of fewer cells and the process of regeneration is more complex.
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Select the correct answer. Which statement about natural selection is true? A. Natural selection and evolution are two terms for the same phenomenon. B. Natural selection is an outdated theory to explain how evolution took place. C. Natural selection is the process by which organisms with more beneficial traits are more likely to survive and reproduce. D. Natural selection is the process by which organisms develop variation in traits, which gives them a better chance of survival.
Answers
Answer:
C. Natural selection is the process by which organisms with more beneficial traits are more likely to survive and reproduce.
Explanation:
Natural selection is an evolutional process by which species of living organisms with stronger or more beneficial traits have higher chances of survival and reproduction. In other words, it is the process by which organisms adapt and survive.
Organisms in a population are all different in their own ways. And those with characteristics or traits better suited for the environment are more likely to survive than those without. The selection prefers more beneficial traits and not wholly on the superiority of the organism. So, the survival and reproduction chance of an organism depends on the presence of traits beneficial to the environment, which is how nature selects. And in this process, those selected will dominate the population while those rejected will be reduced or even die.
Thus, the correct answer is option C.
NEED HELP ASAP
To believe in Jesus as his Savior, Nicodemus had to turn through faith and:
good deeds
repentance
love
works
Answers
Answer: repent
Explanation:
Mark looks at an unknown cell under a microscope. What structure could he observe to help him identify whether the cell came from a plant?
A. Nucleus B. Cell Wall
C. Cytoplasm D. Cell Membrane
Answers
Because that’s how a cell for plants look like.
Explanation: Both plant and animal cells have a nucleus, a cytoplasm, and a cell membrane, but only plant cells can have cell walls.
Bladder wrack grows more quickly than saw wrack.
Suggest an explanation why.
Answers
Answer: The bladders hold lots of air.
The main purpose of dna is to store information. where is information stored within a dna molecule?
Answers
The information in DNA is stored in the sequence of nucleotides along the DNA molecule.
A nucleotide is a building block of DNA and consists of a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base. There are four types of nitrogenous bases in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). The sequence of these nitrogenous bases along the DNA molecule constitutes the genetic code or the information stored in DNA.
The sequence of nitrogenous bases in DNA is read in triplets called codons. Each codon codes for a specific amino acid or a stop signal. The linear sequence of codons along the DNA molecule determines the sequence of amino acids in a protein, which in turn determines the structure and function of the protein. The information stored in DNA is replicated during cell division and is also transcribed into RNA, which is then translated into proteins.
Thus, the sequence of nucleotides in DNA plays a fundamental role in the inheritance of traits from one generation to the next and in the functioning of living organisms.
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What is the meaning of the idiom yellow journalism?.
Answers
Using sensationalism and grotesque exaggeration to draw readers and make news eye catching in is known as "yellow journalism."
Yellow journalism, often known as yellow press, refers to journalism and related newspapers that show little to no real, in-depth news in favour of employing eye catchy headlines to boost readership. Techniques could involve sensationalising, exaggerating newsworthy occurrences, or some combination of these. When it was at its height in the late 19th century, it was one of several elements that influenced the United States and Spain to go to war.
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5. Why isn't the radiometric dating of sedimentary rock exact? O O Because sedimentary rock only forms where there were ancient seas. Because sedimentary rock is constructed of many different layers. Because sedimentary rock is made up of weathered and eroded bits of igneous rock. Because sedimentary rock only contains carbon-14 and no other radioactive isotopes.
Answers
The radiometric dating of sedimentary rock is not exact due to the fact that sedimentary rock is made up of weathered and eroded bits of other rocks, including igneous rocks.
. Why isn't the radiometric dating of sedimentary rock exact?Radiometric dating relies on measuring the abundance of radioactive isotopes and their decay products within a rock sample. However, in the case of sedimentary rock, the minerals within the rock are typically not the original components but rather fragments from different sources. These fragments may have different ages and could have undergone various geological processes before being deposited as sedimentary rock.
As a result, the different minerals and fragments within the sedimentary rock may have different isotopic compositions and ages. When attempting to date a sedimentary rock using radiometric methods, it becomes challenging to accurately determine the initial composition of the minerals and the timing of their formation.
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HELP PLSSSSSSSSSssssssss
Answers
Explanation: Rider A would have potential energy, not kinetic
Metalloproteinase requires which mineral to be present before degradation of collagen occurs?
Answers
Metalloproteinase requires zinc mineral to be present before degradation of collagen occurs.
What is metalloproteinase ?An enzyme that can degrade proteins, including collagen, that are typically present in the gaps between cells in tissues (i.e., extracellular matrix proteins). These enzymes are referred to as metalloproteinases because they require calcium or zinc atoms to function effectively. Angiogenesis, tumor cell metastasis, and wound healing all require matrix metalloproteinases.
What is role of zinc in metalloproteinase ?Of the four primary protease categories, metalloproteases are the most varied, with more than 50 families now recognized. A divalent cation, typically zinc, activates the water molecule in these enzymes. Three or more amino acid ligands are often used to hold the metal ion in place.
Thus from above conclusion we can say that the degradation of collagen and other ECM proteins is achieved through a family of metalloproteinases, which require zinc for their activity.
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the watery fluid that provides both shape and nourishment to the anterior part of the eye is called vitreous humor. sclera. aqueous humor. choroid.
Answers
The watery fluid that provides both shape and nourishment to the anterior part of the eye is called: aqueous humor.
Aqueous humor is a clear, watery fluid that is produced by the ciliary body in the eye and circulates throughout the anterior chamber, which is the front part of the eye between the iris and the cornea. It helps to maintain the shape of the eye and provides nourishment to the cornea and lens.
The balance of production and drainage of aqueous humor is important for maintaining proper intraocular pressure and preventing conditions such as glaucoma.
The aqueous humor is constantly produced and drained in a balanced manner to maintain the intraocular pressure, which is important for maintaining the shape of the eye and providing nutrients to the cornea and lens.
Changes in the production or drainage of aqueous humor can lead to conditions such as glaucoma, which can damage the optic nerve and cause vision loss.
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Monica has two large dogs and a small dog. The dogs like to play tug-the-rope with each other. Each of these three diagrams shows one way that the dogs play together with the rope. Look at each arrow and the number that goes with it. They show the direction and amount of force each dog exerts on the rope. Look at the MIDDLE diagram, where the large dog and small dog tug on the rope. Which statement correctly explains the amount and direction of the net force acting on the rope, and in which direction will the rope move?
Answers
In the middle diagram, you have a large dog and a small dog tugging on the rope. Let's analyze the net force acting on the rope and the direction it will move.
When considering the forces exerted by each dog, we must take into account both the direction and the amount of force. The large dog exerts a greater force than the small dog due to its size and strength.
The direction of the forces is opposite, as each dog pulls the rope toward itself.
To determine the net force, we subtract the smaller force from the larger force, keeping the direction in mind. Since the large dog exerts more force, the net force will be in the direction of the large dog.
As for the movement of the rope, it will follow the direction of the net force. In this case, the rope will move towards the large dog, as it is pulling with a greater force than the small dog.
In summary, the net force acting on the rope is the difference between the forces exerted by the large and small dog, with the direction favoring the large dog. Consequently, the rope will move in the direction of the large dog.
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PLEASE ANSWER THIS QUESTION ASAP THIS COUNTS A GRADE! PLEASEEEEEEEE
I put in the picture and the question is “What is the optimum temperature for the clam development?”
PLEASE use the picture to answer the question. :)
Answers
Answer:
30
Explanation:
because most clams developed at 30 degrees
Which of the following is NOT a geologic indicator of building geothermal power plant?
I. volcano
11. geyser
III. hot spring
IV. rocky mountain
V. trench
A. I, II and IV only
B. I, II and III only C. I and II only
D. IV and V only
Answers
Answer:
C. 1 and 2 only
Explanation:
hope it helps<3Volcano and geyser is not a geologic indicator of building geothermal power plant, hence option C. I and II only is correct.
What is geothermal power plant?Geothermal power plants rely on heat that resides a few kilometers beneath the surface of the Earth to collect enough energy to generate electricity.
The heat may naturally exist underground in some places as pockets of steam or hot water. But in order to generate steam, the majority of places need to be "enriched" with water injection.
By boring deep wells into the earth and bringing hot water or steam to the surface, people can make use of these resources. An electric turbine is propelled by hot water or steam.
Therefore, some geothermal wells reach a depth of up to two miles. To turn generator turbines, dry steam plants employ steam that is extracted directly from geothermal reservoirs.
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A substitution mutation occurred and changed the 5th base in the DNA from a C to a T. Write the sequence of RNA codons that would result from this kind of mutation. **Separate each codon with a space. TACACGCAATTACCAGGGTAGCCATTGATT
Answers
The sequence of RNA codons resulting from the substitution mutation that changed the 5th base in the DNA from a C to a T is AUGUGCGUUAUCCAGGGUAGCCAAUUGA.
In DNA, the base C (cytosine) pairs with G (guanine), while in RNA, the base C pairs with G. However, due to the substitution mutation, the original C is replaced by a T (thymine) in the DNA sequence.
In RNA, thymine is replaced by uracil (U). Therefore, the RNA codons corresponding to the mutated DNA sequence can be derived by replacing each T with U and maintaining the sequence order.
The original DNA sequence TACACGCAATTACCAGGGTAGCCATTGATT would have the corresponding RNA codons AUGUGCGUUAUCCAGGGUAGCCAAUUGA. Each codon consists of three bases and represents a specific amino acid or a start or stop signal in the translation process of protein synthesis.
It's important to note that the given DNA sequence is provided as a single continuous string, and without additional information about the reading frame or specific gene sequence, it is not possible to determine the precise protein sequence or the functional implications of the mutation.
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A food chain is a way of showing how ________ moves through a community
Answers
hope this helps :)
. Explain how the polarity of water is a major factor that
controls the rate of infiltration in soils. 300 words
Answers
The polarity of water is a major factor that controls the rate of infiltration in soils. This phenomenon is primarily attributed to the unique properties of water molecules and their interactions with soil particles.
Water is a polar molecule, meaning it has a slight positive charge at one end (hydrogen) and a slight negative charge at the other end (oxygen). This polarity arises due to the unequal sharing of electrons between hydrogen and oxygen atoms within the molecule. As a result, water molecules exhibit an electric dipole, with the oxygen side being more electronegative and the hydrogen side being more electropositive.
When water comes into contact with soil particles, which may be composed of minerals or organic matter, the polarity of water plays a crucial role in infiltration. The surface of most soil particles carries a net negative charge (known as a negative surface charge). These charged particles attract the positively charged hydrogen ends of water molecules through electrostatic forces.
This attraction between water molecules and soil particles helps to overcome the force of gravity acting against infiltration. Water molecules bind to the soil particles and create a thin film of water around them. This process is known as adsorption. The adsorbed water molecules create a bridge between soil particles, reducing the friction between them and facilitating further infiltration.
Moreover, the polarity of water also contributes to its cohesive and adhesive properties. Cohesion refers to the tendency of water molecules to stick together, while adhesion refers to the ability of water molecules to adhere to other surfaces. These properties allow water to form continuous columns or chains, enhancing its movement through soil pores and facilitating infiltration.
Additionally, the polarity of water enables it to dissolve various substances. Soil particles often contain ions, organic compounds, and nutrients that are essential for plant growth. Water's ability to dissolve and transport these solutes further aids in nutrient uptake by plants during infiltration.
In summary, the polarity of water is a critical factor influencing the rate of infiltration in soils. Its ability to form hydrogen bonds with soil particles, reduce friction, and facilitate the movement of water through soil pores is essential for efficient water infiltration and nutrient transport in terrestrial ecosystems.
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Which of the following units would be best for measuring the mass of a
person?
A.milligrams
B.grams
C.kilograms
D.centigrams
Answers
100 POINTS!
list Mendel's 7 F1 crosses (Genes) on pea plants.
Answers
Answer: See below
Explanation:
Mendel crossed:
pea shape, either round (dominant) or wrinkled
pea color, either green or yellow (dominant)
pod shape, inflated (dominant) or constricted
pod color, either green (dominant) or yellow
flower color, either purple (dominant) or white
plant size, either tall (dominant) or dwarf
and position of the flowers, either axial (dominant) or terminal
Hope this helps
which action is most likely lead scientist to change improve an existing scientific theory about evolution
Answers
The discovery of new evidence or inconsistencies is likely to lead scientists to improve an existing theory of evolution.
The most likely action that could lead a scientist to improve an existing scientific theory about evolution is the discovery of new evidence that contradicts or challenges the current understanding. Science is a dynamic field that constantly evolves as new information becomes available. If a scientist comes across empirical data that cannot be explained by the existing theory or if inconsistencies arise, it may prompt them to reevaluate and modify the theory. This could involve conducting further experiments, gathering additional data, or proposing alternative explanations. Additionally, advancements in technology, such as new techniques for genetic analysis or fossil discoveries, may provide insights that necessitate revisiting and refining the theory of evolution. Critical analysis, rigorous experimentation, and an open-minded approach are crucial for scientists to refine existing theories and develop a more comprehensive understanding of evolution.For more such questions on Evolution:
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What geologic process creates an alcove
A) glaciation
B) wind erosion
C) tectonic uplift
D) coastal erosion
Answers
Answer:
wind erosion
- i know this question is older but i hope this helps anyone who may need it. :-)
The geologic process that creates an alcove is wind erosion, which is present in Option B, as the alcove is a recessed area in a rock or cliff face that is often semicircular in shape.
What is wind erosion?Alcove is created by the process of wind erosion. Over time, wind can carry abrasive particles, such as sand or small rocks, that erode the softer rock on the face of a cliff, carving out a hollow space. As the wind continues to erode the rock, the hollow can deepen and expand, forming an alcove. Alcoves are often found in areas with strong, consistent winds, such as desert regions, and can range in size from small niches to large, room-sized spaces. In addition to wind erosion, alcoves can also be created by other geologic processes such as water erosion or tectonic activity.
Hence, the geologic process that creates an alcove is wind erosion, which is present in Option B.
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These plants have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. There is one type of spore, and the gametophyte generation grows outside of the spore wall. Which plant or plants am I describing? (SELECT ALL THAT APPLY) 000000000 Ferns Cycads Selaginella Lycopodium Conifers Ginkgo Hornworts Mosses Angiosperms 3 pts Liverworts
Answers
The correct answers are: Ferns, Hornworts, Mosses, and Liverworts.
The plants that fit the given description are:
Ferns: Ferns have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Ferns produce one type of spore, and the gametophyte generation grows outside of the spore wall.Horworts: Hornworts also have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Hornworts produce one type of spore, and the gametophyte generation grows outside of the spore wall.Mosses: Mosses have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Mosses produce one type of spore, and the gametophyte generation grows outside of the spore wall.Liverworts: Liverworts also have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Liverworts produce one type of spore, and the gametophyte generation grows outside of the spore wall.Therefore, the correct answers are: Ferns, Hornworts, Mosses, and Liverworts.
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Human genetic material is represented in the diagram below.
A
The region labeled A is made up of a section of
i a protein that becomes an enzyme
2
DNA that may direct protein synthesis
a carbohydrate made from amino acids
4
glucose that may be copied to make DNA
Answers
Answer:A
Explanation:it makes sense
True or False: After a muscle fiber contracts, it needs a brief period to recover before contracting again.
Answers
Answer:
True
Explanation: is correct/post protected