Well Primary Succession means you are the first organisms of that area after it is destroyed completely or if it's new. Secondary Succession is when an area is not destroyed completely but the organisms that remain colonize the area again. I believe it's C.
Explanation:
The explanation for the question is in the"Hardy-Weinberg principle" pdf attached below.
Structure L and I are the superior and inferior vena cava. They bring de-oxygenated blood from the body into the right atria.
