Think about it, for the first one, blood is primarily made up of water. dehydration is the lack of water. lower volume of water in the body=lower blood volume.
second one, low blood pressure
third one, not sure... sorry
Answer:
Cuticles
Explanation:
;) (don't ask me why i know)
Answer:
Because it helps kill germs.
Answer:
biology
Explanation: But physics is good too