modern humans have: a. large browridges, large nasal sinuses, and a large masticatory complex. b. a high vertical forehead, a round and tall skull, and small browridges. c. a small face, small teeth, and a projecting chin. d. both b. and c.
Answers
Modern humans have traits a high vertical forehead, a round and tall skull, and small browridges
The lighter skeletons of modern humans can be used to identify them anatomically from ancient humans. Modern humans have extraordinarily large brains, which vary in size from population to population and between males and females. The average size of these brains is approximately 1300 cubic centimetres.
Many of the physical and behavioural traits that modern humans have evolved share some similarities with other early human species, though not to the same extent. Modern humans were able to connect with their environment and one another in novel and unusual ways thanks to their complex minds. Our predecessors were better able to survive as the environment got more unpredictable thanks to larger brains.
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Related Questions
Can someone help me with just these three questions!
Answers
Answer:
Use the formula to answer
Explanation:
There is a formula that you should've taken note of that includes weight, velocity, and distance. The distance formula I believe.
how many chromosomes are present in a cell from the same organism in prophase i of meiosis?
Answers
The chromosomes in the cell from same organism would be diploid during meiosis I beginning and therefore the number of chromosomes would be 24 in Prophase I of meiosis.
Meiosis is the cell division where one parent cells divides to form 4 daughter cells that are haploid in nature. This is the reason it is called reductional division. The process is completed in two phases: meiosis I and meiosis II. The cells are initially diploid in the beginning of meiosis II.
Chromosomes are the compact structures that contain the genetic material. They are comprised of DNA strand and the histone proteins. The transfer of genes from one generation to another takes place in chromosomal form.
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The given question is incomplete, the complete question is:
A cell in prophase II of meiosis contains 12 chromosomes. How many chromosomes would be present in a cell from the same organism if it were in Prophase I of meiosis?
REPOST!!
What describes the first law of thermodynamics?
OA) Energy cannot be converted without the loss of usable energy.
OB) The energy of a system approaches a constant value as the temperature approaches
absolute zero.
OC) Energy cannot be converted from one form to another without a net gain of usable
energy.
OD) Energy can be converted from one form to another, but it cannot be created or
destroyed.
Answers
Answer:
od ) Energy cannot be converted from one form to another but it cannot be created not destroyed
Explanation:
Energy had no stable state hence can be transformed from one to another
By block sodium channels, a compound found in pufferfish, called ______, prevents action potentials from occurring.
Answers
Answer:
Tedrodotoxin
Explanation:
I'm not the best at these, nor can provide much insight, but this toxin is very effective at its job
g3p is the product of the calvin cycle and the first reactant in many metabolic reactions in a plant cell leading to the production of which other molecules?
Answers
g3p is the product of the Calvin cycle and the first reactant in many metabolic reactions in a plant cell leading to the production of other molecules including 3PG, BPG, and G3P are similar 3-carbon molecules.
In contrast to the five G3Ps that must be recycled to regenerate the RuBP acceptor, one G3P molecule exits the cycle and is used to produce glucose. A complex chain of reactions is involved in regeneration, and ATP is needed. G3P, which is typically regarded as the primary end-product of photosynthesis, can be utilized as an immediate food nutrient, combined with other substances to create monosaccharide sugars, like glucose, which can be transported to other cells or packaged for storage as insoluble polysaccharides, like starch.
The Calvin cycle's end product, G3P, is a source of other molecules that plants require. One of the organic molecules produced by G3P metabolism is glucose phosphate, as you will see. Several plant cell metabolic pathways start with G3P as the first reactant.
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In the diagram below, label parts A-L next to the words in the structures of photosynthesis box below.
Answers
A leaf; B a cuticle; C a layer of skin; D a layer of mesophyll cells Chloroplast E Nucleus F See the entire response.
What characteristics does the nucleus have?
Properties. The cell's genetic material is housed in the nucleus, a membrane-bound organ that also regulates cellular growth and reproduction. It is typically the cell's most noticeable organelle. The nuclear envelope is the framework that encloses it. This membrane divides the cytoplasm from the nucleus's contents.
What functions does a cell's nucleus serve?
DNA-containing chromosomes are housed in the nucleus. DNA contains instructions for cell development, growth, and reproduction as well as genetic information. The chromosomes of a cell are arranged into lengthy, tangled structures called nucleosome while the cell is "resting," or not dividing.
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Growing the
most efficient
variety of plants
for an area
Chemicals used
to kill insects
Chemicals used
to increase crop
growth
Cutting fields
into hillsides.
← PREVIOUS
?
?
?
?
Pesticides
Fertilizers
Monoculture
Terracing
Answers
Answer:
pesticides
Explanation:
seems like the best option!!!!!!!!
Growing the most efficient variety of plants for an area:
Selecting plant species that are well-suited to the local climate, soil conditions, and pest pressures.
Maximizing growth and yield by choosing varieties adapted to temperature, rainfall, sunlight, and soil fertility.
Chemicals used to kill insects (Pesticides):
Pesticides are used to control or eliminate pests that can damage crops.
Insecticides target insects, while herbicides target weeds.
Proper use is important to minimize negative environmental and health impacts.
Chemicals used to increase crop growth (Fertilizers):
Fertilizers provide essential nutrients to plants for healthy growth and maximum yields.
They contain nitrogen, phosphorus, potassium, and other micronutrients.
Cutting fields into hillsides (Terracing):
Terracing involves creating flat surfaces or steps on sloping fields.
It helps prevent soil erosion, improves water management, and conserves soil.
Monoculture:
Monoculture refers to growing a single crop species over a large area.
It can maximize yields and simplify management but increases vulnerability to pests and diseases and depletes soil nutrients.
These practices play a role in efficient plant cultivation, pest management, nutrient supplementation, and soil conservation, contributing to sustainable agricultural practices.
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PLS HELP :"(
I dont think what I wrote down is correct just ignore it :")
Answers
Answer:
Facilitated diffusion and phosphate
Explanation:
For the second one, ATP stands for adenosine triphosphate, and ADP stands for adenosine diphosphate. "Tri" means three, so when ATP turns into ADP, it loses one phosphate.
Answer:
Facilitated diffusion & phosphate
give other person brainliest :)))
Explanation:
Epithelial cells in the dermis of the skin create a water-tight seal between the outside world and the body. These epithelial cells are able to create this protective barrier with the help of ____________ linking the cells together.
Answers
Epithelial cells in the dermis of the skin create a water-tight seal between the outside world and the body. These epithelial cells are able to create this protective barrier with the help of tight junctions linking the cells together.
Tight junctions, also known as zonula occludens, are protein complexes that connect epithelial cells together to create a barrier that prevents the leakage of water and solutes between them. Tight junctions serve as a selective gatekeeper for the movement of ions and molecules through the paracellular space. The skin is the largest organ in the human body, and it acts as a protective barrier between the body's internal organs and the outside world. It is made up of two layers: the epidermis and the dermis.
The epidermis is the outermost layer of skin and is made up of several types of cells, including keratinocytes, melanocytes, and Langerhans cells, among others. The dermis is located beneath the epidermis and is made up of fibrous connective tissue. The tight junctions of epithelial cells play a vital role in creating a water-tight seal between the outside world and the body.
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Which category of organic molecule has the most chemical energy
Answers
Answer:
FatsExplanation:
Fats are storage of energy in form of organic molecules in our body.
most species of bacteria cannot be eaten by humans because the bacteria contain. True/False ?
Answers
Most species of bacteria cannot be eaten by humans because the bacteria contain toxic levels of nucleotides.
The smallest single-celled living things are called bacteria. There are countless varieties of bacteria. Your body contains a variety of things that are good for you. Your microbiome, which is made up of these bacteria, maintains your body healthy. You may become ill from other bacteria. Antibiotics are commonly used by medical professionals to treat bacterial infections. In comparison to eukaryotes, several bacterial species may contain 8% of their weight in nucleotides. Humans are poisoned by such high concentrations of nitrogen-containing nucleotides.
Bacteria are single-celled, microscopic living things. The word for just one is “bacterium.”
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The Nernst equilibrium potential for an ion that is 10 times more concentrated in the cytosol compared to the extracellular fluid is about -61.5 mV. What would the equilibrium potential be if the extracellular concentration decreases 100-fold with no change in the intracellular concentration?
Answers
If the extracellular concentration decreases 100-fold with no change in the intracellular concentration, the new equilibrium potential would be approximately -90.3 mV.
The equilibrium potential for the ion would become more positive if the extracellular concentration decreases 100-fold with no change in the intracellular concentration. Using the Nernst equation, the new equilibrium potential can be calculated as:
E = (RT/zF) * ln([ion]out/[ion]in)
Assuming the ion has a charge of +1, and using the new extracellular concentration ([ion]out) of 1/100th of the original concentration, the new equilibrium potential can be calculated as:
E = (RT/F) * ln(0.1/1)
E = -61.5 mV * ln(0.1)
E = -88.6 mV
Therefore, the new equilibrium potential would be approximately -88.6 mV.
Hi! To answer your question, we can use the Nernst equation:
E_ion = (RT/zF) * ln([ion_out]/[ion_in])
where E_ion is the equilibrium potential, R is the gas constant, T is the temperature, z is the charge of the ion, F is Faraday's constant, and [ion_out] and [ion_in] are the extracellular and intracellular concentrations, respectively.
In the initial scenario, [ion_out] is 1/10 of [ion_in], so the ratio is 1/10. In the new scenario, the extracellular concentration decreases 100-fold, making the new ratio 1/(10*100) or 1/1000.
Plugging the new ratio into the Nernst equation:
E_ion(new) = (RT/zF) * ln(1/1000)
Since we know the initial potential is -61.5 mV, we can compare the two equations:
-61.5 mV = (RT/zF) * ln(1/10)
E_ion(new) = (RT/zF) * ln(1/1000)
The only difference is the ln term, so we can write:
E_ion(new) = -61.5 mV * (ln(1/1000) / ln(1/10))
Calculating the result:
E_ion(new) ≈ -90.3 mV
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What is work?
A. The amount of force applied over time
B. The product of a force moving something over a distance
C. The total amount of time it takes to move something
O D. The amount of power used
Answers
Answer:it’s A
Explanation:
Which of the following hormones acts on target cells via a second-messenger system?
A. Thyroid hormone
B. Aldosterone
C. Cortisol
D. Epinephrine
Answers
Correct option is D, Epinephrine, or adrenaline, is a hormone produced by the adrenal gland. It acts on target cells by binding to adrenergic receptors present on the cell surface.
Upon binding, epinephrine triggers a cascade of intracellular signaling events through a second-messenger system.
Second messengers are small molecules that relay signals from cell surface receptors to intracellular proteins. They facilitate the transmission of signals within the cell, ensuring rapid and efficient communication.
Two well-known second-messenger systems are the cyclic AMP (cAMP) system and the phosphatidylinositol bisphosphate system.
In the case of epinephrine, it binds to adrenergic receptors on target cells, activating the G protein-linked receptor system. This activation leads to the production of cyclic AMP as a second messenger molecule.
Cyclic AMP then initiates various intracellular responses, such as the breakdown of glycogen and the release of glucose into the bloodstream.
Therefore, epinephrine acts on target cells via a second-messenger system, specifically the cAMP system.
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Read the article below. Then answer the questions that follow.
MONOCULTURE AND THE FOOD SUPPLY
In 2011, scientists announced that the Cavendish banana, the banana that most frequently makes it to American consumers, could be wiped out by a fungus if the fungus reached fields in Latin America where the banana is grown. It had happened before with the Gros Michel banana, which was wiped out between 1906 and 1960 and is no longer grown by farmers. The reason for scientists' concern: monoculture.
Monoculture is a practice common among farmers. In most fields, you will find a single crop and these plants are not very genetically diverse. This means they are less able to adapt to environmental changes and less able to fight off diseases. Many scientists are concerned that the practice of monoculture farming means that many crops, including bananas, may be subject to total loss or even extinction.
Heirloom Plants
One way that scientists think that food supplies can be protected is by using heirloom plants. An heirloom plant is a plant that was once grown by farmers but is not used in modern monoculture farms. Many heirloom plants are more genetically diverse than modern varieties, which mean they are better able to adapt to environmental change. They are also more likely to survive an attack by a pest or infection by a disease or fungus. However, heirloom plants usually do not produce as much food as modern varieties do.
Organic Farming
Organic farming combines older agricultural practices with modern practices and does not involve the use of synthetic materials such as manmade fertilizers and pesticides. It relies on scientific knowledge about the interactions among organisms and about natural materials that can be used to fertilize plants and control pests. Organic farming does not generally involve monoculture, and an organic farm will have many different kinds of crops. Organic farming practices usually reduce the chance of total crop loss, but like heirloom plants, organic farms are often less productive than conventional farms in terms of volume of food.
Genetically Modified Organisms
Genetically modified organisms, or GMOs, are organisms that have been genetically engineered by people. Many scientists think that concerns over the risks of monoculture can be alleviated by directly changing the genes of crops. They argue that the crops can be given resistance to pests and disease, can be modified to withstand drought, and can be engineered to produce more food. However, many people are concerned about the safety of GMOs, so they are highly controversial. The technology is new and involves the use of bacteria to insert genetic material, so people are concerned that the organisms may negatively affect human health.
Because of what scientists have learned about monoculture, they are:
not pushing for a change in farming.
asking for legislation mandating GMOs.
suggesting ways to protect food supplies.
telling farmers they need to grow fewer kinds of crops.
Answers
Answer: suggesting ways to protect food supplies
Explanation:
Butterflies usually are identified by the colors and patterns on their wings. Butterflies have four wings: The two wings near the butterfly’s head are “forewings” while the wings near the butterfly’s tail are “hindwings.” You can use the following dichotomous key to identify four common butterfly species in North America.
Answers
The shown butterfly in the diagram is - Papilio polyxenes.
Butterflies usually are identified by the colors and patterns on their wings. To identify an organism using a dichotomous key, compare the organism’s traits to the first pair of descriptive statements on the key.
Follow the directions after each matching statement until you get to the organism’s identity.The points on the hindwings identify the butterfly as
a swallowtail butterfly is either Papilio glaucus or Papilio polyxenes.1. Hindwings rounded ………………… Goto 3
2. Wings mainly yellow …………… Papilio glaucus
Wings mainly black ………….. Papilio polyxenes
3. Wings orange with black piping…Danaus plexippus
Wings yellow with black edges….. Colias philodice
The wings are mainly black, so the butterfly is Papilio Polyxenes (common black swallowtail)Thus, the shown butterfly in the diagram is - Papilio polyxenes.
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which best describes bacterium?
Answers
Answer:
Bacteria (singular: bacterium) are classified as prokaryotes, which are single-celled organisms with a simple internal structure that lacks a nucleus, and contains DNA that either floats freely in a twisted, thread-like mass called the nucleoid, or in separate, circular pieces called plasmids. Hope this helps :))
Explanation:
Answer:
Bacteria are classified as prokaryotes, which are single-celled organisms with a simple internal structure that lacks a nucleus, and contains DNA that either floats freely in a twisted, thread-like mass called the nucleoid, or in separate, circular pieces called plasmids.
Explanation:
What term means removing the nucleus from a cell?
Answers
Answer:
enucleation
Explanation:
i got it right
Scientists have developed methods that allow the insertion of a gene into a bacterium.How would this biotechnology help someone who has diabetes
Answers
Answer:
Insulin production
Explanation:
The gene for insulin can be I serted to an organism then the produced insulin will be used for treatment of diabetes
How are protozoans classified into phyla?
Answers
Answer:
On the basis of light and electron microscopic morphology, the protozoa are currently classified into six phyla. Most species causing human disease are members of the phyla Sacromastigophora and Apicomplexa
Explanation:
8. Review the four principles of how teratogens affect development that were discussed earlier in chapter 4. Explain how these principles are related to the principles of reaction range and gene-environment relations.
Answers
The principles of how teratogens affect development reflect the complex interplay between genes, the environment, and the timing of exposure.
Principle of Susceptible Periods: This principle states that there are specific periods during prenatal development when the developing organism is most vulnerable to the effects of teratogens. Different organs and systems have different windows of susceptibility. For example, the central nervous system is particularly susceptible during early embryonic stages. This principle is related to the principle of reaction range, which suggests that genes establish a range of potential outcomes, and environmental factors determine where within that range an individual's development will fall. Principle of Critical Periods: Critical periods refer to specific time frames during prenatal development when certain structures or processes are particularly sensitive to teratogens. Disruptions during these critical periods can have severe and long-lasting effects on development.
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Which of the following best defines PRODUCERS?*
1 poin
process by which light energy is converted to chemical energy, produces sugar and
oxygen from carbon dioxide and water
organism that obtains its energy and nutrients by eating other organisms
organism that obtains its energy from abiotic sources, such as sunlight or inorganic
chemicals
the process of using chemical energy to make sugars from carbon dioxide for energy
storage
Answers
Answer:
Photosynthesis
Photosynthesis. Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel. These primary producers form the base of an ecosystem and fuel the next trophic levels.
A hospital patient with an infection has a body temperature of 99.4 degrees Fahrenheit. An hour later the patient's temperature is 100.4 degree of the following explanations best describes the homeostatic response happening in the patient's body?
(A) Their body is undergoing a negative feedback loop to return their body temperature to a normal range
B They have a fever in the hospital and their body is not undergoing any homeostatic response
(c Their body is using a negative feedback loop to try and get rid of the infection in their body
(D) Their body is undergoing a positive feedback loop to raise their temperature to get rid of the infection
Answers
Answer:
C
Explanation:
The Answer is C becuase of the fact that our bodies use a negative feedback loop to try and get rid of whatever our problem is so when Our temperatures rise it means our bodies are trying to get rid of whatever we are facing so that way we can get back on the normal things that we do.
I hope this helped.
What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized? a. The origins of replication occur only at the 5^{\prime} end. b. Helicases and single-strand binding proteins work at the 5 ' end. c. DNA polymerase can join new nucleotides only to the 3 ' end of a pre-existing strand. d. DNA ligase works only in the 3^{\prime} \rightarrow 5 ' direction.
Answers
The basis for the difference in how the leading and lagging strands of DNA molecules are synthesized is that DNA polymerase can join new nucleotides only to the 3 ' end of a pre-existing strand.
The correct answer is [C].
DNA polymerase can join new nucleotides only to the 3 ' end of a pre-existing strand. This is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized. DNA polymerase is the enzyme that joins the nucleotides together to make new strands of DNA.
It can only do this in the 5' to 3' direction, meaning that it can only add nucleotides to the 3' end of an existing strand. In the leading strand, DNA synthesis occurs continuously, but in the lagging strand, it occurs discontinuously as Okazaki fragments.
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true or false: environmental factors may influence the expression of some genes.
Answers
True. Environmental factors can influence the expression of some genes. Gene expression refers to the process by which genetic information is used to produce a functional gene product, such as RNA molecule.
Environmental factors such as diet, exposure to toxins, stress, and lifestyle can all influence gene expression. For example, some studies suggest that exposure to certain chemicals can alter the expression of genes involved in the development of cancer, while a healthy diet and exercise may promote the expression of genes associated with good health.Gene expression is a complex process that involves multiple steps, including transcription, RNA processing, translation, and post-translational modifications. Environmental factors can affect gene expression at various stages of this process. For example, environmental factors may affect the binding of transcription factors to DNA, which can regulate gene expression. They can also affect the stability or modification of RNA molecules, which can influence the translation of genes into proteins.
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What geological change and event occurs at a transform boundary?
A. Plates collide, and a trench is formed.
B. Plates move apart, and a rift is formed.
C. Plates collide, and a mountain is formed.
D. Plates slide past one another, and a fault is formed.
Answers
what molecule is the oxygen used to create inside the cell?
what is the name of this process ? What is the purpose of the molecule that is produced ?
Answers
Answer:
Cellular respiration can occur both aerobically (using oxygen), or anaerobically (without oxygen). During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. The purpose of the ATP is to store energy for future reactions or be withdrawn to pay for reactions when energy is required by the cell.
An example of a genetic disorder that is caused by a sex-linked recessive
allele is
Answers
What best explains the relationship between structure and function of the cell membrane? a The lipids forming the membrane provide energy for protein synthesis. b The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell. c The fluid inside the membrane buffers the chemical reactions taking place inside the cell. d The single-layer membrane surrounding the outside of the cell that allows for the easy removal of waste.
Answers
Answer: The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell."
Explanation:
If all the plants in a habitat suddenly died, what would happen to the animals?
A.
The animals would plant new plants.
B.
The animals would start eating rocks.
C.
The animal population would grow because they would have more space.
D.
Animals that could not leave would also die after some time.
Answers
Answer:
D. Animals that could not leave would also die after some time.
Explanation:
A is incorrect because animals aren't like humans, and most likely don't know how to plant and grow new plants. B is incorrect because no animal eats rocks. C is incorrect because even though they have "more space", they don't have any plants to eat so they would die off. This leaves answer D which is correct because they would die off as well. Plants and animals depend on each other.
Answer:
the answer is d
Explanation:
the animals that eat the plants will die from starvation and the animals that eat them will then also die from starvation