Why is it best to have a resting heart rate below 70 beats per minute

Practice or pre-exercise theories of play pose the idea that a. play provides children with an opportunity to practice adult activities. b. play is necessary to reenergize human cognition. c. children have too much energy and play will rid them of that energy. d. children are the link between animals and human beings.

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Explain why hiv is a life-threatening sti.