The third one is correct.......
D Type. He is changing the type of activity he is doing for his bike-riding routine.
Answer:
Glycogen
Explanation:
Glycogen. Glycogen is the principal storage form of glucose in animal cells. ... Sometimes called "animal starch" for its resemblance with starch found in plants, it is stored in liver and muscle cells and can be converted to glucose if needed. In the liver this conversion is regulated by the hormone glucagon.
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