The study of the average performance of groups of individuals is called research

The number of deaths of infants under one year old per 1,000 live births in a given year is referred to as the infant ______ rate.

A) mortality B) morbidity C) incidence D) prevalence

Because humans are social as well as biological in nature, our chances of survival improve when we:

a. work independently. b. belong to a group. c. plan ahead. d. focus on ourselves.