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Physics 21 Online
OpenStudy (anonymous):

2. A minimum of how many minutes is needed to achieve the benefits of cardiovascular activity ? ( 1point ) A . 10 - 15 b. 20 - 30 c. 30 - 45 d. 45 - 60

OpenStudy (eric_d):

It should be the 2nd option @iopeyou

OpenStudy (eric_d):

@iopeyou

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