I think B but I maybe wrong please correct
Answer:
<u><em>stapes</em></u>
The stapes is the smallest and lightest bone in the human body and is so-called because of its resemblance to a stirrup (Latin: Stapes).
Explanation:
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Cells create tissues which create organs which make up systems so i believe the answer is D i hope this helps :)
Cytotoxic can directly attack and kill other cells