Each cell is surrounded by a <u>membrane</u> that separates the interior of the cell from its surroundings.
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It is because it's surface area is responsible for the production of ATP molecules.
<span>The correct answer to this question is C - an autotroph is an organism that has to produce it's own food rather than finding sources of food elsewhere, so an example of this might be a primary producer. Plants and certain types of bacteria are all autotrophic.</span>
Answer: there were few valleys 375 million years ago because during the acadian orogeny, the tectonic plates collided, forming mountains. This habitat was often snowy and cold at the summits of the mountains, and warmer and rocky in the foothills.
Explanation:
