Human infants begin smiling shortly after birth as a result of:
a. Happy moods.
b. cephalocaudal development.
c. Seeing their mother.
d. Spontaneous CNS activity.
Question 2
The evolved arms race between the different sets of genes in a pregnant female is sometimes referred to as:
a. Red Queen Hypothesis.
b. Von Baer's Law.
c. Red King Hypothesis.
d. Appeasement.