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

Fact 2: Among the unsaturated fatty acids are compounds with one, two or three double bonds.

Given the two facts above, answer the question "Plants use what type of compounds to store energy?" with the following options: 
- thermal insulators
 - It helps them survive
 - during the day
 - spring, summer, autumn, winter
 - compounds with double bonds
 - hydrogen and oxygen
 - Something with exactly eight protons
 - it helps plants in growing


 

     compounds with double bonds    