Multiple Choice
Which runner is engaging in aerobic exercise?
A) John, a 20-year-old whose heart rate is 210
B) Denver , a 40-year-old whose heart rate is 100
C) Sean, a 50-year-old whose heart rate is 130
D) Austin , a 90 years old whose heart rate is 50
Correct Answer:

Verified
Correct Answer:
Verified
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