instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
You call the hard case that surrounds the soft parts of some animals the exoskeleton.
answer:
What do you call the hard case that surrounds the soft parts of some animals?

question:
Process of desalinization helps provide cleaner water for agriculture.
answer:
Which process helps provide cleaner water for agriculture?

question:
During the synthesis phase, dna replication occurs in the cell cycle.
answer:
What phase does dna replication occur in the cell cycle?