A national study found that approximately ___ percent of the people in the United States suffered from PTSD at some point

Sense receptors are specialized cells that convert physical energy in the environment or in the body into electrical energy that can be transmitted as nerve impulses to the brain

Indicate whether this statement is true or false.

Two social norms that can affect when people decide to help are:

a. reciprocity and social engagement. b. reciprocity and social responsibility. c. social responsibility and social conscientiousness. d. social responsibility and descriptive.