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Some teenagers seem able to skate, play basketball, or dance for hours without rest. This increased endurance is best explained by: A. increased hormone output. B. increases in muscle tissue. C. better digestive processes. D. the growth of the heart and lungs

/in /by

Some teenagers seem able to skate, play basketball, or dance for hours without rest. This increased endurance is best explained by:

A. increased hormone output.
B. increases in muscle tissue.
C. better digestive processes.
D. the growth of the heart and lungs

 
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