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

Fact 2: The air in the greenhouse is humid.

Given the two facts above, answer the question "What are two things that are important for plants?" with the following options: 
- organic material
 - Bubbles and soap
 - Humidity and protection
 - excretory structures
 - Sand and rocks
 - Darkness and cool winds
 - food and shelter
 - genetic diversity


 

   Humidity and protection      