The answer is Succession. It is the gradual sequential regrowth of a community of species after a forest fire. Particularly, Secondary Succession, which is the sequential replacement of species that follows disruption of an existing community (natural disaster or forest fire)
A sample is a random, unbiased selection out of a larger group. An independent variable is one that is changed as to see how it will affect the dependent variable in an experiment.
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A biodiversity
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I think it’s A because electrons actually taken up by oxygen molecules to make water.
