What type of force does a bookbag exert on the body

Which statement is most correct about self esteem?

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.

Answer these and you will be marked this is for 20 points