Explanation:
carbon dioxide released during decay.

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The answer to this will be is : </h3><h2 /><h2>
C. Plant roots grow into a crack in a rock.</h2><h2 /><h2>

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Because "mechanical weathering" It's a example of the Plants roots that grow on into a crack in the rock.
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ノシ
Answer:
most of them require food and oxygen
Explanation:
the plants take the food from the underground and the animals take there food not from the underground but they still eat, so the need food. the oxygen ist normally, when you put plants in a place where is no oxygen they will die, the animals need oxygen too. If you put an animal in a room/place where is no oxygen they will die
B. Cladistics, because the other two choices don't make any sense.