I believe it would be A because paresthesia a tingling sensation in the body... and that would be a symptom.
Answer:
Well it would be D
Explanation:
A: Back blows for de infants
B: well its in a
C: That is for infants
D:Correct i think
The best answer for the blood vessels' valves would be these are veins that would then help in preventing the back flow of blood because the walls have small muscle to pump the blood back to the heart.Hope this is the answer.