The average American adult needs ____ hours of sleep a night, and actually averages about ____ hours

Using a drug in a quantity or a manner that harms physical, cognitive, or psychosocial well-being is called drug

abuse. use. addiction. dependence.

For a simple trait with one dominant and one recessive gene, a person will display the recessive trait

A) if they are heterozygous or homozygous for the recessive trait. B) only if they are homozygous for the recessive trait. C) only if they are heterozygous. D) as long as they inherit one copy of the recessive trait.