Lipids are fats and oils.
Lipids are large molecules made from smaller units of fatty acids and glycerol.
The structure of a lipid molecule
In the diagram, you can see how three long chains of carbon atoms are attached to a glycerol molecule, with its three carbon atoms.
Together they combine to make one lipid molecule. 
Proteins are large molecules made from smaller units of amino acids.
The structure of two amino acids 
Chemical elements that make up ...
Carbohydrates - Oxygen, Carbon, Hydrogen
Lipids (Fats) - Oxygen, Carbon, Hydrogen
Proteins - Oxygen, Carbon, Hydrogen, Nitrogen 
The basic units of carbohydrates are simple sugars, such as glucose and fructose.
These are also called monosaccharides.
Glucose and fructose have the same molecular formula, C6H12O6. However, their structure is different.
1. The structure of glucose
2. The structure of fructose
Sucrose is a disaccharide.
It consists of two monosaccharides, glucose and fructose, joined together.
Starch (found in plants) and glycogen (found in animals) are polysaccharides.
They consist of many glucose molecules joined together. 
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