Piaget believed that __________ are schemes reflecting an infant's repetition of interesting or enjoyable actions that focus on the infant's own body. An example of this might be an infant putting its thumb in its mouth and sucking

One widely-used legal dietary supplement that has been shown to increase strength is

A. ginseng. B. taurine. C. creatine. D. high fructose corn syrup.

A factory worker who gets paid $50 for every 100 carburetors he assembles is reinforced

according to a ____________ schedule. a. variable interval b. fixed interval c. fixed variable d. variable ratio e. fixed ratio