<span>The nitrogen cycle could not exist without first nitrogen. The cycle is about this specific element which goes to show that if this element is not present then, there will not be any nitrogen cycle. Also, an important factor for the cycle is the presence of the bacteria and other microorganism which are needed for the fixation. </span>
Answer:
option B
Explanation:
there are 22 pair of autosome and 2 pair of sex chromosome
Because they are autorotrophs(they make their own food)so most organisms depend on them.
Depolarization and repolarization are part of the action potential.
C. Action potential