Some cells contain large numbers of mitochondria while others have relatively few or none. This suggests that
A) cells with large numbers of mitochondria are short-lived.
B) cells with large numbers of mitochondria have a high energy demand.
C) cells with small numbers of mitochondria have a large ATP supply.
D) cells with large numbers of mitochondria have a low energy demand.
E) some cells are older than others.
Answer: B
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