The immune system fights off the pathogen by Leukocytes also known as white blood cells. When a pathogen enters the body the immune system becomes alert to it and sends out sends out the Phagocytes (a type of Leukocytes) which engulfs the pathogens.
I'm guessing Teens have higher risk
Answer:Balanced regional development is an important condition for the harmonious and smooth development of a country.
Explanation:
You might have a headache or you might be super hot or dehydrated
Probably exercise because with old age your muscles can sore easly and get stuck