What is a polypeptide chain? a. the beginning of a protein
b. the strand of mRNA
c. the strand of tRNA

B

Explanation:

the polupeptide chain is from the strand mRNA which makes wate rmolecules digest into polypeptide

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.

when it is at an intermediate population density