While peering through the microscope, a classmate of yours said, "I know that this thing is supposed to be a ciliate, a flagellate, or an amoeba, but I can't figure out which." You replied, "That's easy, ________."
A. watch how it moves
B. all you have to do is see whether it has a nucleus
C. watch and see what it eats
D. see how big it is
A. watch how it moves
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