Answer:The North frigid zone, between the Arctic Circle 66.5° N and the North Pole 90° N. Covers 4.12% of Earth's surface. The North temperate zone, between the Tropic of Cancer 23.5° N and the Arctic Circle..
Explanation:
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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
Answer:
B. Ethanol
Explanation:
During absence of O2 pyruvic acid is reduced to ethanol in alcoholic fermentation.
Answer:
Digestion
Explanation:
Digestion is breaking up food which in the photo is triangles going from together to separated.
