Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

In circles way do particles of water move in deep water.
In which way do particles of water move in deep water?

Processing of filtrate in the proximal tubule helps maintain the ph level in body fluid.
Processing of filtrate in the proximal tubule helps maintain what level in body fluid?

Vagina term is used to describe the muscular canal (approximately 10 cm long) that serves as the entrance to the reproductive tract.

What term is used to describe the muscular canal (approximately 10 cm long) that serves as the entrance to the reproductive tract?