A certain plant requires moisture, oxygen, carbon dioxide, light, and minerals in order to survive. This statement shows that a living organism depends on:
A. biotic factors.
B. abiotic factors.
C. symbiotic relationships.
D. carnivore-herbivore relationships.
Abiotic factors are nonliving factors in an ecosystem such as the amount of water, light, pH, temperature, etc. These are climatic conditions that control what plants can live there. Obviously, a seaweed can't live in the desert.
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Added: 6/29/2008
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While these questions do not fit the MCAT format (they have no related reading passages) they cover concepts one should understand in order to do well in the biological sciences portion of the MCAT.

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