Answer:
I would say the bleeding one
Explanation:
The nitrogen cycle includes four major processes: nitrogen fixation, nitrification, denitrification and ammonification. ... This results in the reduction of the nitrogen in nitrates back into nitrogen gas which is released into the atmosphere. Ammonification occurs when decaying plants and animals are broken down.
Answer:
C
Explanation:
Membranes will allow and inhibit certain ions/molecules. I don't believe it can distinguish whether the molecules are harmful or beneficial!