Final answer:
Sterols, including cholesterol, are derived from cholesterol and are the basis for all steroids formed in the body. Phospholipids, such as phosphatidylcholine and phosphatidylserine, are composed of fatty acids, glycerol, and a phosphate group.
Step-by-step explanation:
Sterols are derived from cholesterol. Cholesterol is a type of sterol and is found in animal cells. It is the basis for all steroids formed in the body, including cortisol. Phospholipids, on the other hand, are composed of two fatty acids, glycerol, and a phosphate group. Examples of phospholipids include phosphatidylcholine and phosphatidylserine.