Some researchers generally assume if a procedure is psychologically or physically risky, it is more ethical to do such research on animals than on humans

The sexual desire of a woman is primarily determined by hormones produced by her

a. thyroid. b. ovaries. c. posterior pituitary. d. adrenal glands. e. pancreas.

Which of the following statements is a conclusion that can be drawn from the research on young infants' auditory capabilities?

A) The auditory system is not functional before birth. B) By 2 months of age, infants are capable of responding to a broad range of sounds. C) By 6 months of age, infants easily distinguish among rattles, voices, and other environmental noises. D) Newborns are able to detect a 0.5 percent frequency change, easily hearing the softest whisper.