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

Elements are pure substances that make up all matter.
Elements are pure substances that make up what?

Cells are the  basic building blocks of the human body.
What are the  basic building blocks of the human body?

Ovulation takes place in the ovary and is part of the menstrual cycle.

Ovulation takes place in what organ and is part of the menstrual cycle?