The first sentence is not correct, while the second one is. I believe "interrogative indefinite subject pronoun" would describe the function of "what". I'm sure someone will come up with a better term.
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PhilipThe first sentence is not correct, while the second one is."What does it mean to explain something in science?"
I believe "interrogative indefinite subject pronoun" would describe the function of "what". I'm sure someone will come up with a better term.