The microscope prove the theory of blood circulation.
a. true
b. false?

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

Chicken pox and hepatitis are bacterial diseases. true or false?

Me with these questions if you’re it sure don’t answer