Critical periods are times when the environment can influence the development of the embryo

Because some behaviors occur rarely or in private, it can be useful to use methods other than

a. surveys. b. correlational methods. c. observational methods. d. experimental methods.

Eric's father is in the military and has been away from home

for over nine months without leave and has not seen his son since Eric was two months old. Eric's father comes home and is anxious to spend time with his wife and son. However, during the first few hours of his return, Eric cries and screams when he is alone with his father (without his mother being present). Eric is exhibiting a. infantile amnesia. b. motherese. c. egocentrism. d. separation anxiety.