Fact 1: Agreenhouse is used to protect plants from the cold.

Fact 2: Plants are grown in greenhouses and protected from wild butterflies.

Given the two facts above, answer the question "Plants are grown where they are protected from what?" with the following options: 
- the sky
 - disease
 - storms
 - cold air
 - the water
 - the warmth
 - sun's heat
 - the cold


 

        the cold 