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

The cell starting meiosis is called a primary oocyte.
The cell starting meiosis is called a what?

Water and humidity is the critical factor for the survival of segmented worms.
What is the critical factor for the survival of segmented worms?

Diffraction is the phenomenon in which light and sound waves become circular at the point source of a barrier.

What is the phenomenon in which light and sound waves become circular at the point source of a barrier?