The primary causes of death are different for people of different ages. What is a primary cause of death for people in middle adulthood?

Which of the following is considered the most frequent cause of romantic relationship breakups?

A) Kinky sexual practices B) Jealousy C) Emotional isolation D) Money problems

The "pleasure pathways" or internal reward centers in the human brain are primarily made up of a. dopamine-sensitive neurons

b. serotonin-sensitive neurons. c. both dopamine-sensitive and serotonin-sensitive neurons. d. none of these