instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Darwin believed in gradualism.
answer:
Did darwin believe in punctuated equilibrium or gradualism?


question:
600 million many years ago may the earliest fungi have evolved.
answer:
How many years ago may the earliest fungi have evolved?


question:
The binary halides are an important subclass of salts.
answer:
The binary halides are an important subclass of what?