You are presented with the question "what uses unsaturated fatty acids to store energy" and the following answer choices: 
- clouds
 - volume
 - density
 - Conifers
 - organisms
 - Oak
 - cactus
 - alpacas

Now knowing that plants use unsaturated fatty acids to store energy and plants like cactus and sagebrush can survive, choose the best answer.


 

       cactus  