Given a scientific question, generate a correct answer to it.

Ex Input:
What is the name for the stratospheric gas layer that protects living things from uv radiation?

Ex Output:
ozone layer

Ex Input:
What is cytology.

Ex Output:
the study of cell structure

Ex Input:
Enzymes speed up the rate of a specific chemical reaction and is therefore known as what?

Ex Output:
biochemical catalysts