How does air enter the body? a. nose b. mouth c. nose and mouth d. neither nose or mouth

C, the nose and mouth.

Explanation:

Think about how you breathe. When you breathe, some mostly do so in through the nose, and vise versa with the mouth. Some people do it with the nose and the mouth equal times.

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.