An individual's heart rate will tend to increase steadily until it reaches its maximum - the maximum frequency at which a heart can beat.
Usually people who exercise don't come to this point where their heart couldn't go up anymore as this is extremely taxing on one's body.
The right answer is D.
Vitamin A promotes growth, improves vision (anti-xerophthalmic).
Vitamin A helps maintain normal vision and contributes to healthy skin, eyes and the immune system. It also promotes growth and development.
* Vitamin A which is fat soluble is stored in the body.
* Vitamin A is found in foods of animal and vegetable origin. Vegetable foods contain carotenoids (an orange-colored pigment), a form of vitamin A. Carotenoids, such as beta-carotene, are converted to vitamin A by the body.
D, by wearing protective clothing I believe.
<span>I would say peer pressure influence teenagers to end up engaging in drug or alcohol abuse. One other thing is poverty,cause many teenagers end up dropping out of school to work and help provide for their families but some just drop out of school because of use of drugs and end up committing crimes.</span>
anatomical structure, blood type, as well as similar instincts(fight or flight response) and emotions(sadness, anger, happiness).
