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Circulatory System › View

What function does the heart do?
A. Protects organs and produces red blood cells.
B. Generates heat.
C. Breaks down food into nutrients.
D. The heart is a pump, which moves the blood. The arteries and veins are the pipes where the blood flows.

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Immune System › View

Adaptive immunity is

A. Specific

B. Non-specific

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