A single celled organism such as the amoeba used its cell membrane organelle to take in oxygen and remove carbon dioxide. Which organ system in humans has the same functions as the cell membrane of the amoeba A. Digestive
B. Nervous
C. Circulatory
D. Respiratory

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.

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