A social smile typically occurs when an infant
a. was recently fed. c. sees another human face.
b. is asleep. d. is at least 1 year of age.
c
You might also like to view...
Which of the following statements about fragile X syndrome is true?
A. It only affects males. B. It only affects females. C. It occurs in about 1 in every 3,000 U.S. births. D. It occurs in both males and females.
Sam was an accomplished furniture maker and was paid well each time he produced a set number of pieces of furniture. Sam was on a _____ reinforcement schedule.
A) variable-ratio B) fixed-ratio C) fixed-interval D) variable-interval
Individual characteristics of the juveniles being treated have a great impact on the outcome of the treatment
Indicate whether the statement is true or false
At the beginning of the period of the embryo, the __________ system develops fastest
A) nervous B) circulatory C) digestive D) skeletal