2. How are fossils formed?
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Fossils are formed through preservation: Freezing.

Explanation:

Ice and low temperatures keep organisms from decaying. Large mammals have been found buried in ice, probably caused by earthquakes and avalanches, in Siberia and Alaska.

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.

i believe the answer would be b. hope it : )