instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Water and humidity is the critical factor for the survival of segmented worms.
answer:
What is the critical factor for the survival of segmented worms?


question:
Plankton is the most common life form in the ocean.
answer:
What is the most common life form in the ocean?


question:
Superior sagittal sinus is the largest of the sinuses.
answer:
What is the largest of the sinuses?