A,B,C,D I'm pretty sure, but check with others who answer the question too.
The correct answer is 4.) Eventually they become separate species
A process of formation of a new species from an existing species is called speciation.
When a single species changed into two or more separate species, is called speciation. Speciation can take place due to reproductive isolation. In reproductive isolation, the separated species no longer can interbreed among themselves. This is happened due to mating differences, sterility or environmental barriers which finally results into the adaptive splitting into two species.
<span>This is due to the higher forces needed to pump blood through the systemic circuit (around the body) compared to the pulmonary circuit.</span>
Answer: The idea of natural selection is that traits that can be passed down allow organisms to adapt to the environment better than other organisms of the same species.
Natural selection? Not sure if this helps but.. " A trait that gives the individual an advantage in survival or reproduction, given under a circumstance" sorry if im wrong ]:
