Answer:
F, False
Explanation:
This statement is false. There might be a lot, but not over half of Americans have a BMI of over 30.
When you flex your muscles you are contracting them. When your muscle fibers gain tension through Actin and Myosin crossbridge cycling they may shorten due to the tension. This is called muscle contraction
Teens, athletes and pregnant women need the most calories per day.
Teens need more because they're still growing.
Athletes need extra calories to burn during their exercise.
Pregnant women because they need to feed the baby and themselves.
(Don't know how to explain)
Hope this helps, mark brainliest please!
Sheesh agree with that person^ bc i personally don’t knowww