What must occur in order for two populations to be considered the same species? (A) The Two Populations Must Be Able To Produce
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(B) The Two Populations Must Descend From The Same Ancestors
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(C) Their DNA Must Be An Exact Copy Of Another's

answer: a. a gene that causes a specific trait.

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.

which fault and or fold did you find most difficult to diagram