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.
Answer:
Tightly packed group of older stars large grouping of more than two stars loose, disorganized star cluster held together by gravity large collection of stars, gas, and dust held together by gravity
Explanation:
Google
1,203,375 different species of animals on earth and 1,589,361 different species of plants on earth (so your answer is more)
Answer:
The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries
