TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Water plus other substances makes a(n) solution.

SOLUTION: Water plus other substances makes what?

PROBLEM: 600 million many years ago may the earliest fungi have evolved.

SOLUTION: How many years ago may the earliest fungi have evolved?

PROBLEM: When volume does not change, temperature is proportional to pressure.

SOLUTION:
When volume does not change, temperature is proportional to what other property?