Answer:
Provide Fuel
Explanation:
I think the answer is providing fuel, because these are the 4 main things that lipids do: Within the body, lipids function as an energy reserve, regulate hormones, transmit nerve impulses, cushion vital organs, and transport fat-soluble nutrients.
So based on that, I think it is that one. If it is wrong, please tell me, it would make great use of my knowledge. Thx!