In many important psychological characteristics, a number of genes make a small contribution to the trait in question. This process is known as ________

While empathy develops fairly early, the more complex emotion of ________ occurs later in childhood and adolescence

Fill in the blanks with correct word

Each of the following about cannabinoid type 1 receptors is correct except which one?

a. They are located in the brain. b. They appear to be responsible for the behavioral effects of marijuana. c. They are coupled to ion channels. d. They are widely distributed throughout the brain.