TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Processing of filtrate in the proximal tubule helps maintain the ph level in body fluid.

SOLUTION: Processing of filtrate in the proximal tubule helps maintain what level in body fluid?

PROBLEM: If a gas in a closed area experiences increases in pressure and decreases in temperatures, the volume of the gas will be affected.

SOLUTION: If a gas in a closed area experiences increases in pressure and decreases in temperatures, what other attribute of the gas will be affected?

PROBLEM: 40 m/s north of the following represents the velocity of a moving object.

SOLUTION:
Which of the following represents the velocity of a moving object?