Medical Quiz
★ Circulatory & Respiratory System Quiz

Help fight infections from bacteria, viruses and other invading substances. These are bigger and fewer cells, but increase in number when you are sick.

A. plasma

B. red blood cells

C. white blood cells

D. platelets

Select your answer:
         


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Spongy organ that helps you breathe

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Study of agriculturally relevant microorganisms.

A. Soil microbiology

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