What is proportional to the cell's surface area?
a)rate of carbon dioxide production.
b)rate of glucose consumption.
c)rate of glucose production.
d)rate of exchange of materials.

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.

Ithink the answer is d.

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Iwolud you, but i dont know what you are asking.