its the study of living things and living organisms
Uring this period he became acquainted with Osama bin Laden, a wealthy Saudi who had joined the Afghan resistance to the Soviets,
Answer:
D) habitat isolation
Explanation:
Based on the information provided within the question it can be said that the main factor that keeps the two populations separate would be habitat isolation. This occurs when the different unique characteristics or preferences of the population's habitats prevent them from mating with those with different habitat preferences, thus maintaining them separate.
<span>In marine vertebrates, the gill arches use the external gas exchange. The water holds less oxygen.
The ribs in terrestrial vertebrates have enclosed respiratory surface which is inside the body and comes as paired lungs.
Kidneys are efficient in excretion of regulation of water and nitrogenous wastes. Their reproduction is normally sexual with separate sexes.</span>
