Answer: The heart consists of four chambers, two atria (upper chambers) and two ventricles (lower chambers). There is a valve through which blood passes before leaving each chamber of the heart. The valves prevent the backward flow of blood.
Answer:
The birdie can only be hit once on each side of the net.
I petty sure that it was cartoons.
Sorry if wrong.
Take the medication as directed daily and this will not prevent STI's
Cell membrane is composed of two layers of fatty acids these fatty acids have two domains hydrophobic and hydrophilic.
