Medical Quiz
Biology Quiz

A substance that cannot be broken down into simpler chemical substances is called ___.

A. an atom

B. an element

C. a compound

D. a covalent bond

Select your answer:
A  B  C  D  E 


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Other quiz: Biology

WBCs are formed in the ……

A. bone marrow

B. spleen

C. lymphatic system

D. all the previous