When plants make glucose during photosynthesis, they convert light energy into chemical energy.
During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases - this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.
The goal was to orbit a spacecraft around the Earth. It has people in it. So the answer is B.
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