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Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

How dose plate tectonics effect climate

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?