The immune system is the body's first line of defense against pathogens.
Answer:
D
Explanation:
sitting playing a game will most likely decrease your physical activity
The 1900’s
With the turn of the century came a push for organized medicine, led in part by the American Medical Association (AMA), which was growing stronger and gained 62,000 physicians during the coming decade. But because the working class wasn’t supportive of the idea of compulsory healthcare, the U.S. didn’t see the kind of groundswell that leading European nations would see soon after.
Bacteria, viruses, and fungi
