Which of the following is considered INCORRECT posture for a crunch? keeping your head stationary
moving until only your shoulder blades are off the ground
placing your hands behind your head or neck
keeping your legs straight out in front of you

The nature–nurture issue refers to the debate over the relative contributions that make to the development of psychological traits. a.introspection and nerve cell activity b.unconscious and conscious motives c.behavior and mental processes d.genes and experience