8. When and where would you expect to find the highest rate of primary productivity? O A. In the temperate regions during the summer months
O B. In the tropics during the fall
O C. In the polar regions during the summer months
O D. In the polar regions during the fall

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

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it enhances antibody production by t cells of the adaptive immune system.

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