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

Smaller size of ring will a summer drought cause in a tree.
What size of ring will a summer drought cause in a tree?

Trichomoniasis is cause by a protozoa.
Trichomoniasis is cause by what type of pathogen?

The process for developing knowledge is called science.
What is the process for developing knowledge called?