The answer is d it makes your heart muscle stronger
Answer:
biting you tongue hurts when it not on purpose because your body is ready to take the impact of you teeth and when its not on purpose, you tongue is soft and easy to cut through
Explanation:
Answer:
Diseases of the immune system are especially dangerous because they attack the very cells that destroy other diseases. AIDS (auto immunodeficiency syndrome) basically makes the immune system kill itself. Basically, white blood cells kill other cells, (including its own white blood cells) instead of killing viruses or bacteria, in turn making your immune system very weak. If your immune system is weak, a simple cold can turn into a nightmare, and can even result in death.
