I believe that it relates to or involves free oxygen, if it is used in exercise- aerobic practices help improve the the efficiency of the body's cardiovascular system with absorbing and transporting oxygen.
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Answer:
C. extrinsic motivation
Explanation:
Extrinsic motivation can be useful for persuading someone to do something. Before offering a reward-based task, it's important to know if the person doing the task is motivated by the reward being offered. For example, extrinsic motivators can be useful to help children learn new skills. (When used in moderation.)
Answer: D) Muscle length
Explanation:
Muscle length determines its ability to produce enough strength for the task that requires it. This is so because, in human anatomy, the muscle has various types of muscle fibers. Some are longer and others are shorter. However, the optimal distribution of these fibers over the muscle (that is, that their different lengths are balanced) will make it possible to concentrate the necessary force.