Which describes the basic structure of a fatty acid?

Fatty acids and glycerol best describes the basic structure of lipids. Fatty acids is one of the major components of triglyceride. It is a form of lipids that is used to store energy. Fatty acids are composed largely of a chain carbon atoms bonded with hydrogen atoms. At one of the ends of fatty acids is called carboxyl group. In terms of number of carbons, they are typically an even numbers. 

Only algae, oak trees, and bermuda grass produce atp by photosynthesis i am almost positive