Other than predation by introduced Nile perch, the most likely explanation for the recent decline in cichlid species diversity in Lake Victoria is ________. (A) reinforcement (B) fusion (C) stability (D) polyploidy
Answers
Other than predation by introduced Nile perch, the most likely explanation for the recent decline in cichlid species diversity in Lake Victoria is fusion
What is Cichlid Species?
The largest tropical lake in the world, Lake Victoria, also known as the freshwater heart of Africa, has an area roughly equal to Scotland. More than 350 species of cichlid (pronounce "sick-lid") species, which are unique only to this region, once called it home. Although cichlids are small fish, millions of people in the three nations that surround the lake—Kenya, Uganda, and Tanzania—used to rely heavily on them as a source of food. Cichlids are well-liked for home aquariums due to their frequently vibrant colours, and they are practically unique among fish in the manner they defend their young from predators.
Around 500 species of cichlid fish with a bewildering range of appearances, habitats, and habits swim in the shallow waters of Lake Victoria, the biggest tropical lake in the world. In just 15,000 years, according to genomic analyses, they diverged from a small number of ancestors, which has left scientists perplexed about how such rapid genetic diversity could have developed.
Therefore, the correct option is (D)
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Which of the following supports the hypothesis that modern-day choanoflagellates and humans share a common ancestor? Select one: a. An individual choanoflagellate looks a lot like the collar cells found in sponges b. Collar cells have been found in fungi c. Collar cells have been found in bacteria d. None of the above Your answer is incorrect.
Answers
b. Collar cells have been found in fungi, The hypothesis that modern-day choanoflagellates and humans share a common ancestor is supported by the discovery of collar cells in fungi. Collar cells are specialized cells that are found in the choanoflagellates and in the sponges, and are thought to have evolved from a common ancestor.
Collar cells are involved in the filtration of water and the uptake of nutrients, and are thought to have played an important role in the evolution of the choanoflagellates and the sponges.
In fungi, collar cells have been found in certain types of fungi, such as the water molds and the slime molds. These fungi are known for their ability to form colonies and for their ability to absorb and digest nutrients from their environment. The presence of collar cells in fungi supports the hypothesis that modern-day choanoflagellates and humans share a common ancestor, as the collar cells are thought to have evolved from a common ancestor that was present in the early stages of evolution.
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The diagram shows an energy pyramid.
Which level of the energy pyramid contains the least energy?
O A. The middle level
OB. The top level
C. The bottom level
D. All levels contain the same amount of energy
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Answer:
D: All levels contain the same amount of energy
Explanation:
This is due to how the number of animals also increase as the energy pyramid level decreases.
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Answer:
b
Explanation:
Define photophosphorylation?
Answers
The photophosphorylation is the synthesis of ATP from ADP and phosphate in the plants using the light energy absorbed during the photosynthesis process.
which of these are part of the scifitific methood
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Consider how the image of a replicated chromosome below relates to DNA replication. Then, select the one true statement Identical sister chromatids Both chromatids consist entirely of daughter strands. Each chromatid has a daughter strand and a parental strand of DNA. Centromere One chromatid consists of newly replicated DNA, whereas the other chromatid consists of parental DNA. Replicated chromosome
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The statement that is true for the image of a replicated chromosome with respect to DNA replication is that Each chromatid has a daughter strand and a parental strand of DNA.
How the image of a replicated chromosome below relates to DNA replication:DNA replication is the process of producing two identical copies of DNA from one original DNA molecule. In DNA replication, a single DNA molecule serves as a template for the synthesis of two new, complementary strands of DNA.
Each daughter strand is identical to the parental strand from which it was synthesized, and each new DNA molecule consists of one parental strand and one newly synthesized strand. DNA replication is necessary for cell division to occur, because each new cell must receive a complete set of genetic instructions in the form of DNA. When the process of DNA replication is complete, the cell has two complete sets of genetic instructions in the form of identical chromosomes.A replicated chromosome is shown below:Image of a replicated chromosome showing each chromatid has a daughter strand and a parental strand of DNA is given below:
Each chromatid has a daughter strand and a parental strand of DNA, and together they make up an identical pair of sister chromatids. These chromatids are held together at a region called the centromere, and they are separated during cell division to ensure that each new cell receives a complete set of genetic instructions. Thus, the true statement is "Each chromatid has a daughter strand and a parental strand of DNA".
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What happens inside your body when you ride a thrilling roller coaster? (5 points)
1 The adrenal glands release adrenaline.
2 The adrenal glands release glucagon.
3 The thyroid gland releases glucagon.
4 The thyroid gland releases adrenaline.
Answers
The Adrenal glands release adrenaline when one rides a thriller roller coaster.
Adrenaline is a type of hormone that is released inside the boy by the adrenal glands when the mind senses any kind of danger to the individual like running away from an attack or getting ready for a fight or even when in terms of sports etc.
When one rides the roller coaster the body starts to predict the possible danger to the individual and as the sudden movements of the body fluids start to take place when in motion the mind takes it as a sense of danger and starts preparing the body for the danger by producing adrenaline.
To know more about the adrenal gland you can refer to the link given below:
https://www.hopkinsmedicine.org/health/conditions-and-diseases/adrenal-glands
Answer: The Adrenal glands release adrenaline when one rides a thriller roller coaster.
Explanation:
Which Texas ecoregion experiences that largest change in temperature in
а a day?
HELP AGAIN PLEASE
Answers
Answer:
Texas Panhandle
Explanation:
The area borders the state of Oklahoma in the state of Texas. This is a very hot area and to make things worse, it is full of dirt, which means it is very dry. Although the average high temperature in the area was 70 degrees, from 2010 to 2012, Pandelle reached a hot temperature of 95 degrees. These temperatures are one of the hottest in the United States.help me pls, which one is correct?
Answers
Answer:
yes you need to get the last two
Explanation:
did the thing
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Why is the tortoise breeding program on Santa Cruz Island important?
O A. The tortoise population has increased.
O B. No one knows how long a tortoise's lifespan is.
O C. No one knows how two tortoise species became extinct.
O D. The tortoise population has decreased.
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Answer:
The answer to the question is option D
What is a stream created by?
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Which cell structure is responsible for energy production?
Question 15 options:
Structure B
Structure F
Structure C
Structure E
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Answer:
Structure F
Explanation:
Mitochondria is responsible for the production of energy in the cell. Mitochondria is also known as the powerhouse of the cell.
Answer:
F
Explanation:
F is the mitochondria, which is responsible for energy production.
Please help me fast ………
Answers
Answer: B
Explanation:
cellular respiration is a three-part process. Number the processes in the correct order.
Answers
Answer:
Cellular respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport.
Explanation:
...need thanks and make me brainiest if it helps you
Answer:
my mom
my dad
my sister
Explanation:
Which statement does not support the endosymbiotic theory?
1.) Mitochondria and Chloroplasts reproduce independently from the cell.
2.) Mitochondria and Chloroplasts contain their own ribosomes.
3.) Mitochondria and Chloroplasts have DNA that resembles bacterial DNA.
4.) Mitochondria and Chloroplasts are much larger than prokaryotic cells.
Answers
4.) Mitochondria and Chloroplasts are much larger than prokaryotic cells.
no, they are about the same size, another good argument for the endosymbiotic theory is the presence of prokaryotic ribosomes (30S)
The statement that does not support the endosymbiotic theory is:
4.) Mitochondria and Chloroplasts are much larger than prokaryotic cells.
Lynn Margulis, in her endosymbiotic theory, proposes that eukaryotic cells evolved by incorporating prokaryotic organisms into their cytoplasm.
This theory is reinforced by the following facts:
Mitochondria and chloroplasts have some genetic information of their own, which would support their original independence.Both the mitochondria and the chloroplast have their own circular double-stranded DNA freely inside them, independent of the nuclear one. They behave like a bacterium, because they synthesize their own proteins, use 70s ribosomes (and not 80s ribosomes like eukaryotes), perform their functions through the membrane and replicate their DNA and perform binary fission to divide.Therefore, we can conclude that Mitochondria and Chloroplasts are much larger than prokaryotic cells is the statement that does not support the endosymbiotic theory.
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At the superior end of the esophagus, the superior esophageal sphincter is a thickened ring of ______ muscle marking the area where the esophagus and the pharynx meet. Multiple choice question. Circular smooth longitudinal smooth longitudinal skeletal circular skeletal need help
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At the superior end of the esophagus, the superior esophageal sphincter is a thickened ring of smooth muscle marking the area where the esophagus and the pharynx meet.
The superior esophageal sphincter is a thickened ring of smooth muscle that marks the area where the esophagus and the pharynx meet. It is formed by the circular smooth muscle that encircles the junction of the two organs and the longitudinal smooth muscle fibers that run down the length of the esophagus.
The sphincter serves a vital role in the digestion process, as it prevents food from entering the lungs and airways. The muscular ring is controlled by the autonomic nervous system, which is responsible for regulating the opening and closing of the sphincter.
This helps to ensure that food passes into the stomach and not into the lungs or airways. Additionally, the sphincter can help to regulate the speed of digestion, as it can contract and relax to regulate the speed of food passing through the esophagus.
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when calcium ions (ca ) enter the synaptic terminal, neurotransmitter molecules are quickly removed from the synaptic cleft. group of answer choices true false
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False When calcium ions (Ca2+) enter the synaptic terminal, it triggers various processes involved in neurotransmitter release.
rather than the removal of neurotransmitter molecules from the synaptic cleft. Calcium influx into the synaptic terminal occurs in response to an action potential reaching the presynaptic terminal Once calcium ions enter the presynaptic terminal, they bind to proteins called synaptotagmins, which are located on the surface of synaptic vesicles containing neurotransmitter molecules.
This calcium-binding to synaptotagmins leads to the fusion of synaptic vesicles with the presynaptic membrane, causing the release of neurotransmitter molecules into the synaptic cleft through a process called exocytosis After neurotransmitter molecules are released into the synaptic cleft, they interact with receptors on the postsynaptic membrane, transmitting the signal to the target neuron. The removal of neurotransmitter molecules from the synaptic cleft is typically mediated by specific mechanisms, such as reuptake by presynaptic transporters or enzymatic degradation.
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In two or more complete sentences, describe a constant pressure calorimeter and it is used
Answers
The heat capacity can be measured in open calorimeter which is defined as the heat change in a substance if it is cooled or heated by one degree celsius or one kelvin.
The unit will be calorie/K or J / K
It is also expressed as enthalpy of a thermal process.
The heat capacity for one mole of a substance is molar heat capacity.
Heat capacity is an extensive property as it depends upon the mass.
The molar heat capacity is an intensive property as it is independent of mass of material or substance.
The doctor ran some blood tests, including a differential white cell count, and to his delight, John’s T cell count is normal, and there are no signs of HIV antibodies. However, John’s eosinophil, basophil, and neutrophil counts are elevated.
Answers
The differential white cell count is one of the many tests that can be run on a blood sample. It examines the types and numbers of white blood cells, specifically neutrophils, eosinophils, basophils, lymphocytes, and monocytes.
A doctor ran some blood tests on John, including the differential white cell count, to see what might be causing his elevated eosinophil, basophil, and neutrophil counts.
He discovered that John’s T cell count is normal, and there are no signs of HIV antibodies.
In general, elevated eosinophil counts indicate that a person is suffering from an allergic or parasitic infection. Basophils, which are closely linked to eosinophils, can also become elevated in people with allergic reactions or parasitic infections.
Finally, neutrophils are an essential part of the body's immune system, and an elevated count typically indicates that the body is fighting off an infection, inflammation, or injury. In some cases, they may also indicate the presence of cancer.
Since John has elevated eosinophil, basophil, and neutrophil counts, he may be suffering from an allergic reaction, a parasitic infection, or an infection of some kind. The doctor will need to perform further testing to determine the precise cause of John's elevated white cell counts.
This might include more blood tests, as well as imaging scans, biopsies, or other procedures.
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Could a human baby be produced if the vas deferens were cut?
Answers
Answer: A vasectomy is a surgical procedure that cuts or blocks the vas deferens, the two tubes that carry sperm from the testicles to the urethra. The procedure stops sperm from getting into the semen in order to prevent pregnancy.
Explanation:
why exercise raise body temperature?
Answers
Answer:
This is because only approximately 20% of the energy produced in contracting muscles is used for muscle contraction; the remaining 80% is converted to heat energy, and therefore exercise causes an increase in muscle temperature. The heat is distributed to the body by the circulation and increases body temperatures.
Explanation:
Which term describes the area where apopulation lives?A. Age StructureB. Migration LocationC. Growth rateD. Geographic Distribution
Answers
Commonly the place where a population lives is described was a habitat, forming a biological community, however there is not an option with that term, but between the present terms the one that is closer to a term for the area where a population lives is D. Geographic Distribution, since all the other alternatives are related to different factors of ecological studies.
A strand of mRNA has the bases guanine-adenine-cytosine. Which amino
acid corresponds to these bases?
A. Arg
B. Asp
C. Cys
D. Gin
Answers
The answer is: B- Asp.
Explanation: Aspartic acid, symbols Asp, in RNA is encoded by the GAU or GAC codons. The answer is: B
what are second messengers? what are second messengers? voltage-gated ion channels peptide neurotransmitters molecules that activate additional enzymes in the cytosol special proteins that span a 3-nm gap between two cell membranes
Answers
The correct option is A; Molecules that activate additional enzymes in the cytosol,
The cytosolic portion of the liver comprises soluble phase I enzymes such as esterases, amidases, and epoxyde hydrolases, as well as soluble phase II enzymes such as the majority of sulfotransferases (ST), glutathione s-transferases (GST), and N-acetyltransferases (NAT) (NAT).
These enzymes are known as hydrolytic enzymes, and they are responsible for breaking down big molecules into little ones. For example, big proteins can be broken down into amino acids, huge carbs can be broken down into simple sugars, and large lipids can be broken down into single fatty acids.
At integrin adhesion sites, the cytoplasmic proteins integrin-linked kinase (ILK), pinch, and parvin form the complex (IPP). They play critical roles in integrin-mediated signaling [62,63].
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Full Question ;
What are second messengers? Choose the correct option. A) Molecules that activate additional enzymes in the cytosol B) Voltage-gated ion channels C) Peptide neurotransmitters D) Special proteins that span a 3-nm gap between two cell membranes
Second messengers are: (3) molecules that activate additional enzymes in the cytosol.
Second messengers are the signaling molecules that are intracellular in nature. They get activated when an extracellular signaling ligand receptor interaction relays the signal for activation. These second messengers relay signals for the further activation of molecules. Th examples are: cAMP, cGMP, IP3, etc.
Enzymes are the biological catalyst that function to increase the rate of any chemical reaction. The enzymes are usually proteinaceous in nature. They work by lowering down the activation energy of a chemical reaction. The example of enzymes are: peptidase, lipase, catalase, invertase, etc.
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if yu leave rocks submerged in a jar for 90 mins then get a spoon & take them out the jar labeled at 0% acid.
Answers
When you leave rocks submerged in a jar for 90 minutes, you need to take them out of the jar using a spoon and label the jar as 0% acid. The acid is a chemical substance that can corrode rocks and minerals. Therefore, rocks are ideal candidates to determine the effect of acids on materials.
In a scientific experiment, researchers often immerse a specific material in different solutions with different acid concentrations to determine how long it takes to react with the substance. They also use different types of acid to determine the degree of the effect of the acid on the material. The effect of acid on a rock is dependent on the type of rock and acid being used. Usually, rocks have some level of resistance to acid corrosion. For example, minerals such as quartz, feldspar, and mica are considered resistant to acid corrosion. But minerals such as calcite, dolomite, and aragonite are more susceptible to acid corrosion.
Therefore, the type of rock you choose will determine the level of resistance to acid corrosion. When you leave rocks submerged in a jar for 90 minutes, you can determine the resistance level of the rock to acid corrosion.In conclusion, rocks are suitable candidates to determine the effect of acids on materials. When you leave rocks submerged in a jar for 90 minutes, you can determine the resistance level of the rock to acid corrosion. The type of rock and acid being used determine the degree of the effect of the acid on the rock.
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true or false: although it was once thought that bacteria were the causative agent of most peptic ulcers, new evidence suggests that ulcers are usually caused by irritation to the gastrointestinal tract and that bacteria are only rarely involved.
Answers
It is false that "bacteria were the causative agent of most peptic ulcers, new evidence suggests that ulcers are usually caused by irritation to the gastrointestinal tract and that bacteria are only rarely involved." because bacteria have been found to be as causative agent of ulcers,
Peptic ulcers are basically open sores which happen to develop on the inside of the lining of our stomach and even the upper portion of your small intestine. Ulcers occur basically when the stomach acid damages the lining of the human digestive tract. Another common cause of ulcers are anti-inflammatory pain relievers including aspirin.
Bacteria have only very relatively recently been described as a causative agent of peptic ulcers, and new evidence also suggests that the bacterium Helicobacter pylori is somewhat involved in the majority of these cases.
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Which three of the following choices are examples of commons?
O A. The night sky
O B. State parks
O C.Personal computers
O D. A neighbor's swimming pool
O E. Clean air
Answers
Answer:
A
B
E
Explanation:
Commons are land or resources belonging to or affecting the whole of a community.
Introduction: Match the term with its definition.
pastoralism
domesticate
Neolithic Revolution
agricultural hearths
a point when people gained the ability
to cultivate crops and tame animals
places where agriculture developed
independently around the world
to train and breed animals to need the
care of humans to survive; to tame
the raising of livestock such as cows,
goats, and sheep
Answers
Agriculture can be defined as the art of rearing animals and the planting crops for man's use.
What is agriculture?The term agriculture can be defined as the art of rearing animals and the planting crops for man's use.
The following is the accurate matching of the terms;
Neolithic Revolution- a point when people gained the ability to cultivate crops and tame animalsDomesticate- to tame Pastoralism- the raising of livestock such as cows, goats, and sheepAgricultural hearths- developed independently around the world to train and breed animals to need the care of humans to survive.Learn more about agriculture:https://brainly.com/question/3632132
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Answer:
agricultural hearths- places where agriculture developedindependently around the world
neolithic revolution- a point when people gained the abilityto cultivate crops and tame animals
Explanation:
pastoralism- the raising of livestock such as cows,goats, and sheep
domesticate- to train and breed animals to need thecare of humans to survive; to tame
Enzymes are described as catalysts, which means that they __________. View Available Hint(s)for Part A increase the free energy of the reactants to make the reaction go faster provide activation energy for the reactions they facilitate can alter the free energy change (ΔG) for a chemical reaction are proteins increase the rate of a reaction without being consumed by the reaction
Answers
Answer:
Enzymes are proteins that are able to increase the rate of a reaction without being consumed by the reaction. They are also called natural catalysts.
Explanation:
Enzymes increase the rate of chemical reactions inside cells by lowering the activation energy required for the reaction to proceed.
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The parts of an organism's environment that are living or once living, and interact with the organism are ?
Answers
Answer:
Biotic factor
Explanation:
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Protein synthesis depends solely on RNAm and RNAt. True or False and why.
Answers
Answer:
It depends on both of them. Without either the process would not be able to function at all.
Explanation: