Antibodies:. A. play a large role in cell-mediated immunity. B. are produced by both T and B cells. C. are composed of four light and four heavy polypeptide chains. D. are not specific, but act generally. E. have a variable region that binds to a specific antigenic determinant.

E. have a variable region that binds to a specific antigenic determinant.

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answer is

human impact on the environment can be seen in the deterioration of the !

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he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?