The acronym CHNOPS, which stands for carbon,hydrogen<span>, </span>nitrogen<span>, </span>oxygen<span>, phosphorus, sulfur, represents the six most important chemical elements whose covalent combinations make up most biological molecules on Earth. Sulfur is used in the amino acids cysteine and methionine.</span>
I believe that is meiosis. If I am not right then search for it online
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They are joined together by a common centromere.
In secondary succession, the pioneer species are plants that are adapted to exploit disturbances rather than bare rock. They typically include plants such as grasses, birch trees, and fireweed. Organic matter from the pioneer species improves the soil so other trees and plants can move into the area.
Environment, predators, and natural selection.
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