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Biology 15 Online
OpenStudy (anonymous):

BBB

OpenStudy (anonymous):

Aerobic exercise helps to strengthen the cardiovascular system. It can also be called cardio exercise. It CAN be carried out for a sustained period of time..so what's left?

OpenStudy (anonymous):

It does not, however, help strengthen the muscles that help us breathe..it strengthens the heart.

OpenStudy (anonymous):

So I do believe your answer would be A.

OpenStudy (anonymous):

thank you, @lovelylolita55

OpenStudy (anonymous):

You're welcome!

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