Each part of an organ system plays a specific function. Which of the following structures DOES NOT match its function?

A. eyes: sight
B. heart: blood circulation
C. ears: respiration
D. skin: protection

C. ears: respiration

Explanation:

c cause your ears can't breathe meanwhile you can see with your eyes, the heart is the key organ for blood circulation and the primary function of the skin is to act as a barrier.

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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.