I would say D. natrural selection
Answer: Amino acids combine to make proteins.
Explanation:
Answer:
Lipid
Explanation:
Lipids are composed of a glycerol molecule bonded to long hydrocarbon chain(s) (can be single or multiple) and, depending on the lipid, to other molecules—such as a phosphate group (phospholipids). ... Fats Fats consists of glycerol and 3 fatty acids.