Answer:
Egypt had amazing geographical features that kept invaders out. The Mediterranean sea is crucial under that topic due to how much it helped them with invaders and unwanted species.
The heart has four chambers and four valves that regulate blood flow.
Anatomy:
Left and right atria
Left and right ventries
Mitral valve
Tricuspid valve
Aortic valve
Pulmonary valve
It is important because scientific theories are not proven, hence the reason they are called theories. Adding information overtime to these theories can help validate the reliability of said theories.
Less freshwater! Good luck!
