Ascientist finds an unusual living thing and decides to study it.

which observation indicates that the living thing is among the smallest types of living things?

a.
it is multicellular.

b.
it possesses a membrane-bound nucleus.

c.
it possesses a hard outer shell.

d.
it does not have a nucleus.

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.