Fact 1: Agreenhouse is used to protect plants by keeping them warm.

Fact 2: Many orchids are rewarding indoor plants.

Given the two facts above, answer the question "what is a greenhouse used to protect?" with the following options: 
- cellulose
 - Species
 - orchids
 - the sun
 - h2o
 - organisms
 - glass
 - our planet


 

   orchids      