11. What kind of behavior did heavy hitters like Ivan Pavlov, John B. Watson and B. F. Skinner focus on?

The youngest babies change position once every on average. a. 5 minutes b. half hour c. minute d. 10 minutes

What is one way that vance might have been able to prevent this injury?

What should you not do when doing abdominal workouts? a. keep your chin off your chest b. keep your head aligned with the spine c. put pressure on your neck d. all of the above