I believe the answer is retrovirus
Nucleus control the cell and its genetic material
The anwser is (A).<span>Methanogens. hope this helped you out
have a great day :)</span>
Answer: Zoology
<span>Ethology, zoology, biology, and physiology are all branches of science or studies. </span>
<span>Biology studies the life aspects of all living organisms while ethology pertains to animal behavior only.</span>
Zoology is a branch of biology<span> that deals with animals' </span>structure, embryology, evolution, classification, habits, and distribution while physiology is the branch which studies the ways in which a living organism or its body functions.