Answer:
D.
Explanation:
we learned about this in living environment! for example: humans used to have tails but the humans without tails offspringed with the ones with tails causing the genetics to take over making different traits appear in offspring. Therefor, the answer is D.
They are all freshwater. So the closest would be c. an estuary since it has a free connection with the sea since the sea is not freshwater.
So C.
hope this helps!
Electron pairs , because the atoms become stable by gaining the electron pairs
