Answer:
b
Explanation: the server serves for an entire game until they switch to the opponents serving.
4.a
5.d
those are the only ones i'm 100% sure about.
Answer:
A. Earlier Intervention
C. The Development of New Vaccines
D. Education through Social Media
Explanation:
I majored on Health
C. that is your answer because as your heart contracts, blood flows and IF your heart is not strong enough, it will be hard to breathe.