Which of the following illustrates the fact that culture is learned rather than biologically inherited?
a. Humans living in desert environments require about two gallons of liquid a day to maintain constant body temperature.
b. Nonhuman animals eat and drink when they have the urge.
c. Humans have a biological drive to eat and drink.
d. Human societies differ in whether their members eat five meals a day or only one, and what types of food and drink are considered appropriate or taboo.
e. In a harsh environment, there is great competition for available food resources.