Which statement would least likely be used to describe variation?
a) variations are inherited differences between individuals of the same species.
b) variations that decrease reproductive success are more likely to be passed on.
c) variations may result in changes to an entire population after many generations.
d) variations provide some individuals with an advantage.

Variations that decrease reproductive success are more likely to be passed on.

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.

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