can somebody help me answer these questions? :) 1) a virgin pine forest covers a

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can somebody help me answer these questions? :)

1) a virgin pine forest covers a valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and separates the valley with a huge lava flow that the squirrels cannot cross, thus producing two isolated populations of squirrels. what change needs to occur for the 2 populations of squirrels to become separate squirrels?

a) rhe area that the squirrel population occupy changes so that the squirrel populations exist in distinct habitats.

b) the fur color of the two squirrels populations must become distinct.

c) the 2 squirrel populations select mates using the same sexual behaviors..

d) the two squirrel populations become reproductively isolated.

e) the two squirrel populations must eat distinct species of plants..

2) how do new specoies evolve?

   a) speciation can only occur through mutations and genetic drift.

b) none of the choices are adequate explanations.

c) speciation doesn't occur, every specie on earth came into existence at the smae time.

d) natural selection causes populations to adapt to different environments. the populations can evolve genetically and morphologically distinct. which can lead to reproductive isolation, and speciation.

e) when different species reproduce, their offspring become a new specie.

3) which of the following best describes the goal of anaerobic respiration?

   a) to make macromolecules like proteins and carbohydrates.

b) to create chemical energy from sunlight

c) to generate the raw material to make up DNA.

d) to break down ATP

e) to create energy in teh form of ATP from chemical energy.

Explanation / Answer

Que 1

Ans:

A virgin pine forest covers valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and seperates the valley with huge lava flow that the squirrels can not cross, thus producing two isolated population of squirrels. Change needs to occur for the two populations of squirrels to become seperate squirrels is: d) the two squirrel populations become reproductively isolated.

Explanation:

- Many things can seperate one population into two or more groups, like shifting continents or lava flows.

- Reproductive isolation refers to when two groups of animals lives close enough to one another to interact, but unable to interbreed one another.

- Hence, correct option is: d).

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