Why do complex organisms need specialized cells?
a. complex organisms need them to process bacteria and
paramecia.
b. complex organisms need them to balance the mostly prokaryotic
cells.
c. without them, complex organisms cannot perform different
functions.
d. without them, complex organisms cannot reproduce.

this is a good question! i'll do some research and come back when i have the answer!

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.