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

If a substance has a ph value greater than 7,that indicates that it is base.
If a substance has a ph value greater than 7, what does it indicate?

The male reproductive system consists of structures that produce sperm and secrete testosterone.
What does the male reproductive system consist of?

The majority of species live in the ocean.

Where do the majority of species live?