For the most part it’s how mature you are at that age... or if can be caused be gene’s or hormones
Answer:
B. Bigger amount of time for exercise.
Explanation:
When you exercise that gets your blood to flow faster, and heart rate to go up at a good amount. Example; "When I was jogging my fitness tracker had said it was going quite high.".
Answer:
A. It secretes chemical messengers that travel through the blood to signal changes at target cells.
Explanation:
The endocrine system is made up of glands that generate and release hormones; chemical matters produced in the body that control the activity of cells or organs.
Let me know if this helps!
its has to do with how long you exercise