Someone please help!
The picture below shows a model of the human digestive tract.
Which of the following best describes the purpose of this model?
to show how organs in the digestive tract are compressed by contracting muscles
to show the parts of the digestive tract without having to use real organs
A
B
to show how microscopic molecules flow through the digestive tract
D
to show the function of one organ in the digestive tract in isolation

Answer:

the secone option

Explanation:

i just need one more brainliest thanks<3

Answer: The third one

Explanation: It is the third one because scientist have been talking about how there are billions of galaxy's in our universe.    

They're trace fossils, not animal bodies. This coprolite can reveal an animal's diet. Scientists can determine what animal dropped coprolites based on its shape, size, and location.

Fossilized feces are known as coprolites. Because coprolites provide information for the animal's behavior rather than its shape, rather than being considered body fossils, they are instead categorized as trace fossils.

 A coprolite  can provide researchers with information about an animal's nutrition. Scientists are able to determine the species of animal that may have been responsible for the droppings by analyzing the shape and size of the coprolites as well as the location where they were discovered.

Because coprolites have a propensity to deteriorate so quickly, we only find them very infrequently. They are the marine species that are found the most frequently. The presence of coprolites in fish and reptiles is very common.

Learn more about coprolites, here:

https://brainly.com/question/6680528

#SPJ5

Answer:

A. It is a source of genetic variation

Answer:

It should be D.

Explanation:

I hope this helps

Answer:

Directional selection

Explanation:

occurs when natural selection favors one extreme of continuous variation. Over time, the favored extreme will become more common and the other extreme will be less common or lost.

Answer:

The first one

Explanation:

Mark me brainliest please

Answer:

66.7 percent.

Explanation:

Answer:

the correct answer is D!

A spore grows into a mature gamete-producing plant.

Explanation:

hope this helps :)

A spore grows into a mature gamete producing plant is best describe the life cycle of fern.

The life cycle of the fern has two different stages such as sporophyte and gametophyte. The sporophyte stage which releases spores whereas gametophyte stage which releases gametes. Gametophyte plants are haploid whereas sporophyte plants diploid. This type of life cycle is known as alternation of generations.

So we can conclude that a spore grows into a mature gamete producing plant is best describe the life cycle of fern.

Learn more about fern here: https://brainly.com/question/18274355

#SPJ2

Cell Membranes,Ribosome, Cytoplasm are used to make protein

Explanation:

Proteins are formed in a condensation reaction when amino acid molecules join together and a water molecule is removed. The new bond formed in protein molecules where amino acids have joined (-CONH) is called an amide link or a peptide link.

hope it will help you

Answer:

D- Diagram 4

the full moon is represented in diagram four.

Answer:

igneous rock ............

Answer:

Basically, when people say that DNA replication is semi-conservative they are saying that two identical copies are being made from the original DNA strand.

Explanation:

The two new strands contain one side of the original DNA and another side of  synthesized pair.

Cell membrane have been the selective membrane that allows transportation. Sodium and potassium ions need a protein pump as they are charged particles that move against the gradient and need energy. Thus, option D is correct.

Active transport has been the way to move ions and molecules inside and outside the cell membrane. This system of transportation requires energy as the ions move from low concentration regions to the region of the higher electrochemical area.

The sodium and potassium pump needs proteins and energy to move the ions as the inside of the cell is rich in potassium and the exterior is rich in sodium ions. The charged ions moving against the concentration cannot enter the cell without energy and protein pumps.

Therefore, option D. all of the above statements are correct.

Learn more about active transport, here:

https://brainly.com/question/12133248

#SPJ6

Answer:

B

Explanation:

Answer: B

you were correct :) it's sedimentary

sedimentary rocks are created by erosion, weathering, dissolution, precipitation, and lithification

Answer:

the effects of sunlight on the aquatic life inhabiting the Amazon River. The center of all aquatic life in the Amazon is located in The Amazon Basin, the sun makes sure that all fish and plant life can sustain life.

The sunlight affects the aquatic species that lives in the Amazon River. The Amazon Basin is the epicenter of all aquatic life in the Amazon, where the sun ensures that all fish and plant life may survive.

The region of South America that the Amazon River and its tributaries drain is known as the Amazon basin. Approximately 6,300,000 km2, or 35.5 percent of South America, is covered by the Amazon river basin.

The Amazon basin not only contains the world's largest remaining tropical rainforest, it also harbours at least 10% of the known biodiversity, including endemic and threatened species of plants and animals, and its river contributes 15–16% of all river flow into the oceans.

The aquatic animals that inhabit the Amazon River are impacted by sunlight. All aquatic life in the Amazon is concentrated in the Amazon Basin, where the sun ensures the survival of all fish and plant life.

Thus, this is the chief effect of sunlight on the aquatic life inhabiting amazon river.

For more details regarding Amazon Basin, visit:

https://brainly.com/question/18914732

#SPJ2

Answer: C

Explanation: it gets weaker because there not as close together

Answer:

the first option

Explanation:

As the soil gets darker, brown beetles become easily recognised by predators (like birds) and will be eaten. Black beetles however, are better camouflaged and will less likely be spotted by the birds. Black beetles will survive and interbreed, allowing the recessive allele to be passed on to upcoming generations.

Selective pressure is what makes the genetic pool shift toward a particular genotype with a particular phenotype (recessive black in this case) that gives the new generations a selective advantage. They're more likely to survive and reproduce. Survival of the fittest.

Genotype- the genetic makeup of an organism (eg: the recessive gene for black; bb)

Phenotype- physical feature of an organism as determined by the genotype (the colour black)

Selective pressures will increase the number of brown beetles. The correct option is 2.

Any factor that reduces or increases reproductive success in a subset of a population may exert evolutionary pressure, selective pressure, or selection pressure, thereby driving natural selection.

Selection pressure can be defined as a force that causes an organism to evolve in a specific direction.

It is not a physical force, but rather an interaction between natural variation in a species and environmental factors that causes certain forms to have an advantage over others.

A beetle species can be either black or brown in color. A single gene determines the color of the beetle, and black is recessive to brown.

The soil in the area has darkened and taken on the color of black beetles. Brown beetle populations will increase as a result of selective pressures.

Thus, the correct option is 2.

For more details regarding selective pressure, visit:

https://brainly.com/question/27996100

#SPJ2

Answer:

A central heating system provides warmth to the whole interior of a building from one point to ... Institutional heating systems (office buildings or schools, for example) can use low-grade, inexpensive

An alternative to district heating would be to build a small district heating plant together with your neighbours, which is known as local heating or joint heating. ... The local heating system also includes a network of pipes and a common boiler plant that delivers heat through the pipework to the single-family houses.

Explanation:

-Eijiro <3

Answer:

true c this is the answer

Answer:

A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.

Answer:

C. Objects with a small inertia are harder to accelerate than objects with a large inertia.

Answer: The question is incomplete because the options were not given but the options has been gotten from another website.

Here are the options.

a. Wood is routinely recycled to make new wood-based products.

b. Wood products can be manufactured from different tree species.

Eliminate

c. Wood may be replenished by planting new trees to replace those being used.

d. Wood products can be manufactured using various other materials such as plastics.

The correct option is c.

Wood may be replenished by planting new trees to replace those being used.

Explanation:

This is because wood is a Renewable resource because Renewable resources are resources that can be replenish or reproduce again after usage either by naturally producing another one. Theses resources are not exhausted because they can naturally be reproduce again. Wood is a Renewable resources because new ones are planted to replaced the used ones.

Answer: By Snell's law, we can see that the angle of refraction is 30.34°

Explanation:

Snell's law says that:

If a ray in a medium of refractive index n₁, insides with an angle θ₁ in another medium with refractive index n₂, then the angle of refraction θ₂ is given by:

n₁*sin(θ₁) = n₂*sin(θ₂)

We know that:

The incidence angle is 45°, then: θ₁ = 45°

We can assume that the first medium is air, then n₁ = 1

The refractive index of the other medium is 1.4, then n₂ = 1.4

Replacing these in the Snell's law equation we get:

1*sin(45°) = 1.4*sin(θ₂)

Now we can solve this for the angle of refraction:

sin(45°)/1.4 = sin(θ₂)

Asin(sin(45°)/1.4 ) = Asin( sin(θ₂)) =  θ₂ = 30.34°

So the angle of refraction is 30.34°

Answer:

I am pretty sure the answer is B

- I'm sorry of its not correct