D.
A fixed allele is homozygous within a population so D should be the correct answer.
Hope this helps!
Energy is stored in the chemical bonds.
One adaptation that is unique to marine mammals is they nurse their young.. The correct option among all the options that are given in the question is the fourth option or the last option or option "d". I hope that this is the answer that you were looking for and the answer has come to your desired help.
Answer:
An example of a slow change is erosion and an example of rapid change is an earthquake.
