instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Opaque is the term for matter that does not let any light pass through.
answer:
What is the term for matter that does not let any light pass through?


question:
A diploid cell is a cell with two chromosomes.
answer:
What kind of cell is a cell with two chromosomes?


question:
Tough cuticle covering body part helps roundworm prevent their body from expanding.
answer:

Which body part helps roundworm prevent their body from expanding?