Question: what are two main parts of lipid?
Answer: Fats and oils. A fat molecule consists of two kinds of parts: a glycerol backbone and three fatty acid tails. ... 
Saturated and unsaturated fatty acids. As shown in the example above, the three fatty acid tails of a triglyceride need not be identical to each other. ... 
Waxes. ... 
Phospholipids.