The notrogen cycle could not exist without what?

The nitrogen cycle could not exist without bacteria.

Explanation:Bacteria that lived inside the ground, catch the ntirogen that has been fixed and convert it into nitrate.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.