the process if respiraton is essential in the oxygen/carbon dioxide cycle . respiration removes from the atmosphere and produces and releases to the atmosphere

In a relatively small iguana population the allelic frequency is tracked for three generations. webbing is a recessive allele; no webbing is the dominant allele. during one very rainy spring and summer, a flood washes all the iguana without webbed feet out to sea. by the fall, and three generations later, you have the gene pool seen here.

Which factor that affects biodiversity?

The word belongs in a different group than all of the other words in the list.