Which of the following is true about muscle tone?
a. it increases with age.
b. it describes the relaxing of some muscles.
c. it is responsible for keeping the back and legs straight when you re relaxed.
d. it decreases as you exercise more.

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.