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Energy, Hydrology, Microbiology › View

What best explains why all of the Earth’s freshwater is not available for human use?

A. it is in groundwater

B. it is water vapor

C. it is frozen

D. it is all available for human use

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Disease & Immunity › View

Doctors sometimes use a vaccine to prepare the body to defend itself against future infections. These vaccines most often contain

A. antibodies

B. antibiotics

C. white blood cells

D. weakened pathogens

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