Which of the following is not true?
a. evidence exists that biological factors influence human behavior
b. evidence exists that environmental factors influence human behavior
c. the presence of twins is partly based on environmental factors
d. prenatal placental-environment influences behavior in adulthood
e. some forms of behavior are entirely based upon environmental factors

The correct answer is option e. "Some forms of behavior are entirely based upon environmental factors".

Explanation:

There is not an agreement among the scientific community about which degree the environmental and the genetic factors affects human behavior. To this date there has not been a study that assure that based some forms of behavior are entirely based upon environmental factors. The most accepted theory is that both factors have some degree of influence, depending on the human behavior. This evidence has been gathered among different studies, including identical twin studies.

every el niño cycle is different. every year.

the answer for this question would be d. glaciers