“Most girls get their first period when they're between 10 and 15 years old. The average age is 12, but every girl's body has its own schedule. Although there's no one right age for a girl to get her period, there are some clues that it will start soon.”
That is from kidshealth.org
60-100 beats while resting and 204 while exercising. All you have to do is subtract your age from 220
Answer:
The answer will be muscular system
Explanation:
Because the muscular system has the heart and more to help the body stay alive.
D would be the correct answer choice because family social support is very important.
