Why are bacteria a necessary part of the nitrogen cycle?
A. Other living things cannot use atmospheric nitrogen.
B. Other living things cannot use the nitrogen in plants.
C. Bacteria are the main nitrogen reservoir.
D. Bacteria are the main nitrogen transpirators.
Please help me answer this question!! ;)

why are bacteria a necessary part of the nitrogen cycle

My answer will be A other thing cannot use atmosphere nitrogen.

what's the question ?

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.