14. If your 4-month-old infant appears to quickly lose interest in a pacifier that you have just hidden under a blanket, Piaget would say the infant lacks an understanding of .

2. every fitness program should include a. a longer warm-up period than cool-down period. b. a warm-up, a primary conditioning period, and a cool-down. c. at least 60 minutes of cardio activity. d. at least 15 minutes of vigorous activity.