A peer is someone who is the same age as you, and they do not have to even know you. You might be friends, you might not. They might be a student that's in the same grade as you.
basically, a peer is a student that is around your age.
Mental disability are recognized as D abnormal through feeling and behaviors because sometimes feelings can cause emotional outbursts and bad behaviors.
Answer:
1) circulatory and respiratory
2) endocrine
3) circulatory
4) circulatory and nerves
Explanation:
I think these are right. Sorry if they are not.
Cardio is heart, because you heart pumps blood to the organs, tissue, and cells of your body.
1 is Exercising
2 is bodies
3 is mechanics