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

Fact 2: Many orchids are rewarding indoor plants.

Given the two facts above, answer the question "what uses a greenhouse to be protected from the cold?" with the following options: 
- orchids
 - Roundworms
 - freezing
 - clouds
 - animals
 - organisms
 - our planet
 - monkeys


 

 orchids        