Both triglycerides and phospholipids contain a gylcerol backbone. Steriods contain fused rings and are only found in animals.
Phospholipids and triglycerides share a common structural feature in common and that is the presence of a glycerol backbone in the molecule. Glycerol is a three carbon compound. In a phospholipid, there are two fatty acids and a phosphate group attached to the carbon atoms. In a triglyceride, there are three fatty acids that attach to each of the carbon atoms.
Steriods are composed of fused rings and are found in animals. They play very important roles in the body. An example of a steroid is cholesterol.
Matching the items on the left and right of the image;
phospholipid - two fatty acids, a glycerol molecule, and a phosphate group/provides fluidity to the cell membrane
triglyceride - three fatty acids and one glycerol molecule/forms saturated or unsaturated fats
steroid- four fused rings/ present only in animal cells
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