In 1978 nearly 30% of children aged 5 to 10 years had dangerously elevated levels of lead in their blood, which can cause brain damage. What was the rate in 2001 as reported by the Centers for Disease Control and Prevention?

Employee productivity, developing effective employees, and developing a positive work environment are challenges at the _______ level.

a. ethical b. individual c. group d. organizational e. motivational

The evolutionary approach explains behavior and mental processes by focusing on:

A. unconscious factors B. adaptation and natural selection C. learned behavior D. biological influences