What is a vaccine and how can you prevent transmission of a virus?

What is the goal number of sit ups for a 14 year old?

Which term defines one's age as measured by how well the body is working? chronological age biological age social age mental age

The dietary guidelines for americans recommend (a) avoiding smoking. (b) engaging in aerobic exercise for 60 minutes at least five days a week. (c) making all of your grain choices whole grains. (d) increasing your intake of fruits and vegetables.