A) joints, muscles, tendons
It would be best to include research and studies done by .gov sites (government sites) such as the USDA and FDA. One other source that can be reliable is a .edu site used by a college that has does research on the topic.
3: immune system
4: antigens
1: not sure but maybe T-cell
2: how germs get inside our bodies
Answer:
respiratory system and the circulatory system
Explanation:
cuz :)
B- helps you deal with the demands of your daily life
