Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Unicellular eukaryotes are protists normally.

A: What type of eukaryotes are protists normally?
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Q: Matter that mechanical wave energy can only travel through is medium.

A: What is the name of matter that mechanical wave energy can only travel through?
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Q: A electron microscope is used to see extremely small objects.

A:
What type of microscope is used to see extremely small objects?
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