Electrical wires are generally protected by a tube of plastic. A similar insulating function is preformed in the nervous system by:

According to Freud, boys are most likely to experience the Oedipus complex during the _______ stage.

a. anal b. latency c. oral d. phallic

Research indicates that healthy women in their __________ have about the same rates of pregnancy complications as those in their __________

A) thirties; twenties B) forties; twenties C) forties; thirties D) fifties; thirties