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Quick Energy, Energy Storage, and Structure.
Plants polymerise carbs to synthesise cellulose as a structural molecule

Animals synthesise glycogen to circulate a rapidly accessible molecule for chemical energy

Carbohydrate molecules added to proteins in membranes can be used to cell-cell adhesion.


Depending on what level of chemistry you are studying. A simpler answer is they are used
As a fuel of energy
Anti coagulant
And to store food
Q&A Education