As the number of bystanders increases, people are less likely to help someone who is in distress. This suggests that the size of a crowd and helping behavior are

Which of these is NOT an FDA-approved form of nicotine replacement therapy?

A. nicotine water B. nicotine lozenges C. nicotine gum D. nicotine nasal spray

Life expectancy refers to the

a. longest potential lifespan of the human species b. number of years one can expect to live c. expectation of resources needed for living d. expectation that one will marry and have children