Answer:
Follow a healthy lifestyle to keep it at this level. More than 120 over 80 and less than 140 over 90 (120/80-140/90): You have a normal blood pressure reading but it is a little higher than it should be, and you should try to lower it. Make healthy changes to your lifestyle.
They help by doing experiments and finding ways to cure those with diseases etc
Answer:
To eat good food and other stuff
D ...................im pretty sure. if im wrong , tell me the correct answer