Devon's target heart rate zone is 140bpm—177bpm. julian's target heart rate zone is 148bpm—181bpm. they stop running and take their pulse, and both count the heart rate at 173bpm. if they decrease their heart rates by 20bpm, who will be in his thr zone?

Ithink the answer is talking about their problems  

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b

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