People used vaccines to reduce the risk of infection by working with body as defenses to help them so this vaccines develop immunity to disease
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Answer:
During exercise, your heart typically beats faster so that more blood gets out to your body. Your heart can also increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps.
The desert
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The action in which particles go from a high area of concentration to a lower concentration is called diffusion!
