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Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

What is the next step in the process after a substrate enters the active site of an enzyme

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the