Biology Middle School

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Answer 1
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Answer:

Formula

a^2 + b^2 = c^2

a = side of right triangle

b = side of right triangle

c = hypotenuse

Explanation:

Directional selection only occurs in response to naturally occurring events.
Please select the best answer from the choices provided
Тrue
False

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Answer:

False

Explanation:

Directional selection is a force in nature that causes a population to evolve towards one end of a trait spectrum. This change happens gradually and is hard to notice over a short period of time. This change is consistent and constant.

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Answer:

Explanation:

There must be a lot of producers due to the fact that only 10% of energy passes onto the next level. The producers need to keep up with the energy supply so there are many of them.

The picture shows a girl with a widow's peak.



The girl has a widow's peak because of her
genes, which are located in chromosomes in her cells' nuclei.
hormones, which are passed on from previous generations.
nutrition, and indicates her needs are met.
environment, in which it is an advantage.

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what air mass carries warm, moist air
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Maritime air masses form over water and are humid.

Answer:Maritime air masses form over water and are humid. Continental air masses form over land and are dry. Therefore, an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry. One that forms over the Indian Ocean is called a maritime tropical air mass and is warm and humid.

Explanation:

why do lichens and mosses get mostly replaced by larger plant species during succession

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Answer:

Lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. Also, as lichens die, they provide some organic matter that also contributes to soil. Mosses can then colonize the thin soil; as mosses die, the soil thickens more allowing other hardy species to colonize

Explanation:

List eight factors that contribute to desertification.

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Answer:

include urbanization, climate change, overuse of groundwater, deforestation, natural disasters, and tillage practices in agriculture that place soils more vulnerable to wind.

Explanation:

why do animals and plants need nitrogen

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Answer:

They need Nitrogen to make Amino acid, DNA but the nitrogen in the atmosphere can't be used directly. Some nitrogen fixing bacteria fix it then it is able to use for plants and animals.

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Answer:

Plants and Animals need Nirogen and its Sufficent

Explanation:

Plants need Nitrogen especially Crops because they give protein with the help of nitrogen by the help of Rhizobium Bacteria.

With This Protein, Animals ( Herbivores) eat this for energy which contains nitrogen

Why is it difficult for scientist to find fossils from the pre-Cambrian period

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Because Precambrian rocks are in short supply, hence fossil evidence is harder to find.they only discovers sections of some Precambrian rocks there were no bones or shells to be permineralized.
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