Provide a summary of biologist Stephen Stearns’ findings in how Natural Selection may be working today in humans.

Answers

Answer 1

Answer:

Stephen Stearns states that natural selection doesn't mean the survival of the fittest organisms, but rather this mechanism is illustrated by the selective reproduction of the fittest. Natural selection can be classified into distinct types, including directional, disruptive and stabilizing selection, which are in turn based on sexual selection. These types of selection are driven by different outcomes that have different dynamics.


Related Questions


Body systems in the human body work together to support the essential life functions of the body. The urinary system interacts with the cardiovascular system in several significant ways. Which of these is NOT an accurate interaction between the two body systems?

A) The kidneys secrete an enzyme called rennin that helps control blood pressure.
Eliminate
B) The kidneys filter metabolic waste products and toxins from blood for excretion from the body in urine.
C) The kidneys excrete a great amount of sodium and water helping control sodium concentration and blood pressure.
D) The kidneys secrete erythropoietin, a hormone which stimulates the production of white blood cells in the body.

Answers

Answer:

a

Explanation:

the kidney secretes an enzyme called rennin that helps to control blood pressure is not true the kidney does not secret rennin


Which would be the most dangerous to swallow?
A. thermoacidophiles
B. halophiles
C. Escherichia coli
D. a bacteriophage

Answers

Answer:

D. a bacteriophage

Explanation:

A. and B. need extreme environments to survive.

C. is actually beneficial to us, especially in the digestive tract.

D. is a type of virus!

Which traits would Aristotle have used to classify sharks? Choose more than one answer.

Answers

Answer:

The main trait that was different between sharks 14 and 9 was that shark 14 (Mobulidae) has a front with two points that look like horns, whereas shark 9 (Dasyatidae) has a front with no points that look like horns.

Explanation:

The traits that Aristotle would have used to classify sharks are :

Front with points ( hornlike )Front without points

Sharks classification

Sharks whose front have two points like horns are classifed by Aristotle as sharks 14 (Mobulidae). whlie sharks whose front does not have two points like horns are classifiesd as sharks 9 ( Dasyatidae ). hence the traits that would have been used by Aristotle to classify sharks is the presence of points at the front.

Hence we can conclude that the traits that Aristotle would have used to classify Sharks are Front with points and front without points.

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How is the epithelium suited for the substances ?

Answers

Answer:

Epithelial tissue is composed of cells laid together in sheets with the cells tightly connected to one another. Epithelial layers are avascular, but innervated.

Epithelial cells have two surfaces that differ in both structure and function.

The epithelial cells are nourished by substances diffusing from blood vessels in the underlying connective tissue. One side of the epithelial cell is oriented towards the surface of the tissue, body cavity, or external environment and the other surface is joined to a basement membrane. The basement layer is non-cellular in nature and helps to cement the epithelial tissue to the underlying structures.

Germination will not happen unless a seed

A. is dispersed far from the plant that produced it.
B. absorbs water.
C. uses its stored food.
D. grows stamens and a pistil.

Answers

I think it’s B. Absorbs Water

An oak tree can be a home for animals like squirrels, birds, etc. as well as provide oxygen for the environment. This is an example of a _____________: the role an organism plays in the environment.

Answers

Answer:

Commensalism

Explanation:

Commensalism is the condition in which one organism is harmed and the other is neither harmed nor benefited. The animals are being benefited but the tree is neither benefited nor harmed.

1. Summarize the scientific information that leads to conservation in each of the articles.
2. What social issues affected the problem or its solution in each of the stories?
3. How did economics delay scientists' first attempts for conservation in each story?
4. Describe the political actions that led to successful conservation in both stories.

Answers

Answer:

Explanation:

BY USING FOREST WISELY;

It was learnt that people are cutting trees at an worrying rate.This problem is disturbing because ;

1)Those trees are responsible for releasing of oxygen and they made up at least a quarter of the world population.

2) Those trees of the world make up of portion land species by more than forth or fifth portion.

There are also economic implications as a result of trees been cut down, when there is no availability bot trees , it could result to situation whereby there would be scarce of resources for industries as well as

hike price of paper in market, regardless of this trees are needed for manufacturing of important materials such as usage in making houses and others developments or growth

Therefore, all the afformentioned economic concern result in economics delay scientists' first attempts.

COMMUNITY CONSERVATION;

It was learnt that there is to the forest that those gorilla habitated, those human being that reside in those region reside there so they can practice their farming because their is available land there. They also reside there because of housing.

These gorillas were affected as a result of the destruction made to their habitat as well as the activities of the poachers that hunt them for production of the and skin.

There are adverse effect of the obliteration of the gorilla from on the society, it can result to having reduction in tourism in country such as

Uganda as well as Rwanda, as result of this the means of livelihood of people in that part could be affected because there would be Reduction in profit making. Hence the reason behind the increase in number gorillas in the region, because they know they know that those gorilla influence the number of tourist that comes there and the revenue that is generated through this tourism.

The article 'By using Forest Wisely' can be summarised as:

People are cutting trees at the wrong rate and trees play a crucial role in an ecosystem.

The trees produce oxygen and they made up at least a quarter of the world population.

The trees occupy the fourth or fifth portion of the land organisms.

In the absence of trees, the ecosystem will fail and the organisms dependent on them will eventually die.

The resources available from the trees will be scarce and the factories and industries that are dependent on trees will no longer be available.

Trees are required for manufacturing important materials.

The article 'Community Conservation' can be summarised as:

In the article, it was mentioned that the human populace urbanized the land region where gorillas were habituating.

The humans occupied the space to practice farming and make houses.

The population of the gorillas was disturbed and diminished.

The hunting of gorillas by poachers was also reduced.

The people of Uganda and Rwanda also suffered reduction tourism and conservation of wildlife.

Gorillas influence the number of tourists, therefore, the destruction of their habitats led to a reduction in profit-making.

Therefore, all the mentioned economic concerns result in economics delaying scientists' first attempts.

To know more about forest conservation, refer to the following link:

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What is the best definition of a chromosome? Based on the picture provided above :)

Answers

Answer:

d.

Explanation:

A chromosome is a strand of DNA that is encoded with genes. In most cells, humans have 22 pairs of these chromosomes plus the two sex chromosomes (XX in females and XY in males) for a total of 46. The word chromosome was originally coined in German from the Greek words khroma, meaning color, and soma meaning body.

what is the best definiton of genetically motified foods? HURRYYY!!! please and thank youuuu

Answers

Answer:

GMO, or genetically modified foods, are foods that are messed with genetically by science to better benefit the human race. For example, scientists might replace genes that give corn a lower harvest, with a different gene in corn that makes a higher amount of harvest.

Explanation:

You could also look it up. Just search "GMO".

Describe natural selection

Answers

Answer:

Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

Explanation:

best suited to the situation survive, and the ones that aren’t die

what is the role of a cytoplasm​

Answers

Answer:

Cytoplasm is responsible for giving a cell its shape. It helps to fill out the cell and keeps organelles in their place

Explanation:

Cytoplasm contains molecules such as enzymes which are responsible for breaking down waste and also aid in metabolic activity.

The role of a cytoplasm is to act as a medium of suspension for the organelles in the cell

All living organisms are composed of what?​

Answers

All living organisms are composed of one or more cells.So, your answer would be Cell.

hope it helps!


Which layer best represents the mantle?
A. 1

B. 2

C.3

D.4

Answers

2 is the best represent

A virus is ________ a cell.

A)bigger than
b) the same size as
C)smaller than
d)another word for

Answers

Answer:

smaller than

Explanation:

But they're nothing compared to the giants of the cellular world. ... And viruses are smaller again — they're about a hundredth the size of our cells. So we're about 100,000 times bigger than our cells, a million times bigger than bacteria, and 10 million times bigger than your average virus

Hope this helps <3

Red squirrels and gray squirrels have been the native species on an island for many years. A few years ago, black squirrels entered this island. The black squirrel is an invasive species. Invasive species aren't native to the ecosystem. They move into an ecosystem because of natural changes or human intervention. Red squirrels and black squirrels have identical food requirements, but gray squirrels have a different diet. What three effects will these events have on the island's squirrel population?

Answers

Answer:

1. There will be direct predation of species.

2. There will be competition for limited resources like breeding sites, prey.

3. Transmission of diseases or they can cause danger to the native species.

Explanation:

Invasive species are species of organisms that are not natural to an ecosystem and move to an ecosystem because of natural changes and human intervention. Islands are prone to the invasion of invasive species because they don't have predators and there is no competition that control populations in their ecosystem. The invasion of black squirrels will lead to competition for limited resources like breeding sites or prey, the black squirrels will begin to predate other squirrels because they have different nutrients requirements and they can transmit diseases to other squirrels if they are carrier.

Answer:

B C D

Explanation:

GOT IT RIGHT ON PLATO

Which organisms would have the most similar traits?

Answers

Answer:

Organisms in the same family will have the most similar traits.

Organisms mostly will be the same when they are in the same family, and if there are two organisms in different families that look alike, it will be a coincidence.

Answer: organisms in the same order

Yeet Skeet

Identify the type of energy described in each sentence.


gravitational energy
mechanical energy
chemical energy
electrical energy
thermal energy
nuclear energy
radiant energy





The body stores lipids ingested as fat and uses this energy when needed.

A person’s hat falls off and lands on the ground.

A wave of water pushes a surfer to shore.

A burner on a stove heats up a tea kettle.

A power plant splits atoms to generate power for a city.

A nerve sends an impulse to another nerve.

A plant absorbs the Sun’s rays to start the process of photosynthesis.

Answers

Answer:

chemical energy: The body stores lipids ingested as fat and uses this energy when needed.

gravitational energy: A person’s hat falls off and lands on the ground.

mechanical energy: A wave of water pushes a surfer to shore.

thermal energy: A burner on a stove heats up a tea kettle.

nuclear energy: A power plant splits atoms to generate power for a city.

electrical energy: A nerve sends an impulse to another nerve.

radiant energy: A plant absorbs the Sun’s rays to start the process of photosynthesis.

Explanation:

How does your heart rate affect the rate at which red blood cells travel throughout your body? PLEASE HELP ME QUICK!!

Answers

Answer:

with each heartbeat,the heart pumps blood throughout our bodies,carrying oxygen to every cell,after delivering oxygen the blood returns to the heart the heart then sends the blood to the lungs to pick up more oxygen.

Which statements about mutations are true? Check all that apply.

A. Mutations cannot be passed from generation to generation.
B. Mutations are rare.
C. Mutations are always harmful.
D. Germline mutations occur in body cells.
E. Most forms of cancer are caused by somatic mutations.

Answers

Answer:

most forms of cancer are caused by somatic mutations

Explanation:

Answer:

B & E

Explanation:

Just did it and got it right

Which is the best evidence that two species have a common ancestor?

A:The two species have the same diet.



B:The two species live in the same habitat.



C:The two species' skeletal structures are 90% identical.



D:The two species' DNA sequences are 90% identical.

Answers

Answer:

I'd go with D.

Explanation:

Species may share similar physical features because the feature was present in a common ancestor (homologous structures). Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.

The answer should be D

The changing of the rivers created more ____________ for animals

aRegeneration
bVegetation
c Erosion
d Habitats

Answers

Answer:

D) Habitats for animals.

Explanation:

It depends what the question means when it says 'the changing of the rivers'. I took it as the rivers are changing size and becoming more spread out. In that case, I chose habitats.

The more water there is, the more habitat there is for sea life.

All in all, the correct answer is D).

Which body system is an important place for mineral storage, gives us support and structure, and provides a place for muscle attachment? A) digestive B) muscular Eliminate C) nervous D) skeletal

Answers

You’re answer would be D

Answer:

Skeletal

Explanation:

Your bones hold everything together, and help support your body. Also your muscles are attached to your bones. If i'm wrong i'm sorry

Write two sentences on global warming

Answers

Answer:

Global warming is a major crisis in the world. It is when companies or industries dump or pollute the air or the nature that is around us.

Explanation:

Answer:

I'm glad you asked!

Explanation:

Global warming is temperature of earths surface and more, like atmosphere.Global warming is Mostly about temperature and crisis.People are hurting animals in the ocean and throwing garbage.

Hope that was helpful.Thank you!!!

blood type can receive Rh+ or Rh- blood

Answers

Answer:

People with Rh- blood can give blood to both Rh- and Rh+ recipients. However, those with Rh+ blood cannot give to Rh- recipients. If a person receives blood from someone with an incompatible blood type, it can cause a life threatening immune system reaction.

Answer:

Have a nice day.

Explanation:

2 Points
Which best describes the blood flowing in a vein?
O A. It moves toward the heart.
B. It contains no red blood cells.
O C. It is oxygen rich.
D. It contains no white blood cells.

Answers

The Answer Should Be A - It Moves Toward The Heart
A. it moves toward the heart

B and T cells of the immune system have unique B and T cell surface receptors (respectively) as shown above. What is the function of the variable and the constant regions of the B and T cell receptors of the vertebrate immune system? A) There will be an increase in inflammatory response during an innate immune response. B) There will be a decrease in allergic responses on the part of the individual to allergens in the environment. C) There will be an increase in variety of the shape of the B and T cell receptors, allowing them to recognize and destroy more pathogens. D) There will be a decrease in pathogens that can enter the body, resulting in a decrease of antibodies present and circulating in the blood.

Answers

Answer:C. There will be an increase in variety of the shape of the B and T cell receptors allowing them to recognize and destroy more pathogens

Explanation: usa test prep

Answer:C

Explanation: Because I did the USA test prep

Complexity is a measure of how difficult it is to understand something. What is an example of complexity in the natural world?

Answers

Answer:

Answer:

Multicellular organism is the example of complexity of the natural world.

Explanation:

Multicellular organism such as human which is made of billions of cell. Each cell perform a specific function. The function of one organ is different from the other organ. For example, brain of human is made of millions of neurons which takes instructions from brain to the organs and bring messages from organs to the nervous system in the form of electrical impulses. In short every system in our body is full of complexity.

Which type of organism developed first?
A. Chordates
B. Vertebrates
C. Deuterostomes
D. Sponges

Answers

Answer: D sponges, i just got this wrong lol

Explanation:

The correct answer is sponges.

Why sponges develop first?

Sponges belong to the oldest and most simple animals that had evolved, and their discovery in such old rocks meant that they may have been the first animals.

How did sponges evolve?

Among extant animals, only sponges could have evolved directly from protozoa without changing feeding mode.

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Match the time period with the correct layer of fossils (mya = millions of years ago). ITEM BANK: Move to Bottom 175 mya250 mya400 mya 175 mya 0

Answers

Answer:

0 mya, 175mya, 250mya, 400mya

Explanation:

The substance which highest million year ago should be more in-depth in the soil hence 400mpa should occupy the highest depth below the ground.

. Why is the carpel considered female and the stamen male?​

Answers

Answer:  A carpel is the female reproductive part of the flower, interpreted as modified leaves that bear structures called ovules, inside which the egg cells ultimately form and composed of ovary, style and stigma. Stamen, the male reproductive part of a flower, consisting of a long slender stalk and the pollen-producing anther.

Explanation:

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Which resource is a renewable resource?A. CoalB. GemstonesC. MetalD. Trees It is currently 0 degrees outside, and the temperature is dropping 4 degrees every hour. The temperature after h hours is -4h. It can be described with the equation -4h=-14. What value of h makes the equation true? Which of the following countries has the largest population? A. Colombia B. Brazil C. Argentina D. Mexico Please select the best answer from the choices provided A B C D A tire manufacturer has 1000 units of raw rubber to use in producing radial tires for passenger cars and tractor tires. Each radial tire requires 5 units of rubber; each tractor tire requires 20 units. Labor costs are $80 for a radial tire and $120 for a tractor tire. Suppose the manufacturer does not wish to pay more than $15,000 in labor costs and wishes to make a profit of $100 per radial tire and $250 per tractor tire. How many of each kind of tire should be made in order to maximize profit Which statement best describes a characteristic of the Renaissance in Europe What number should be added to x^224x in order to complete the square?-144-2412144 Please help me find MAD for this Which is your least favorite era and why If you spend $448.37 on a car each month, what is your new subtotal of take-home pay after expenses? which of the following are the two themes of the story that evening sun What is the government Directions: Solve each volume problem using the information given. Use 3.14 for pi and label your answer with the appropriate units.1.) The school cheer leading team uses megaphones in their routines. Each megaphone is a cone. The radius of the megaphone is 5.1 inches and the height of the megaphone is 19.3 inches. What is the volume of the megaphone?2.) You and your friends buy ice cream cones at the local ice cream shop. The radius of the ice cream cone is 44 millimeters and the volume of the ice cream cone is 356,456.2136 cubic millimeters. What is the height of the ice cream cone? The table shows the cost in dollars, y, for renting a pair of snow skis or renting a snowboard for x days. Which function shows the combined cost in dollars, y, for renting two pairs of snow skis and two snowboards for x days? y = 45x + 60 y = 90x + 120 y = 25x + 25 y = 20x + 35 Thats all i need to know. Thanks! Prior to WWI, what were the countries of Europe competing for Read the selection from the section "The ItalianRenaissance in context."The rich people of Florence showed offtheir money by paying for artists andthinkers. They were called patrons ofthese artists, and made the city into thecultural center of Europe,Which phrase from the selection BEST helps thereader understand the meaning of "patrons"? 1)Which is NOT a service provided by local government? -conduct elections -trash pick-up -community speed limits -establish Post Offices 2)The job of the state's Executive Branch is to carry out and enforce state laws. t or f3)Local governments get their power from the U.S. Constitution. t or f4)Which of the following does NOT require a state license? -Dentist -Private Investigator -Fitness Instructor -Teacher 5)Setting school requirements such as graduation requirements is a local decision or a state decision? 6)Passing a law or ordinance that bans people from having livestock or barnyard animals is type of local or state law? The Constitution party advances a conservative approach to issues and would most likely support policies that __________.A.reflect our basic principlesB.disregard the Bill of RightsC.expand the role of the governmentD.expand our foreign policy intervention The base of a rectangular prism has an area of 12 square centimeters. The height of the rectangular prism is 3centimeters.What is the volume, in cubic centimeters, of this rectangular prism? Which binomial is a factor of 9x2 64?