Fact 1: Plants use unsaturated fatty acids to store energy.

Fact 2: Plants like cactus and sagebrush can survive.

Given the two facts above, answer the question "what uses unsaturated fatty acids to store energy" with the following options: 
- clouds
 - volume
 - density
 - Conifers
 - organisms
 - Oak
 - cactus
 - alpacas


 

       cactus  