True or false more than 3000 americans die each year from choking

Maintaining a healthy weight allows the respiratory system to work more effectively because a. oxygen is being delivered more adequately. b. the heart does not have to pump as forcefully. c. the capillaries are constricted. d. the lung capacity allows for small amounts of air.

What is a self-improvement strategy for a parent with a busy schedule? a. spend more time watching exercise shows on tv. b. start exercising when the kids are grown. c. use a calendar to plan daily exercise. d. write in a journal about the importance of exercise.

If birth rates fall below the replacement level, then a country is in which stage of demographic transition? a. urbanization/industrialization b. mature industrial c. postindustrial d. pre-modern