The best argument to support the claim that cellulose, chitin, and starch are made from the same elements which are initially produced in photosynthesis is that polysaccharides are produced which can be found in their structural composition of cellulose, chitin, and starch.
It should be noted that polysaccharides which are also known as complex carbohydrates have thousands of monosaccharides. Examples include glycogen, cellulose, chitin, and starch.
They're vital for the storage of energy and also the formation of structures like cell walls. Cellulose, chitin, and starch are made from the same elements that are produced during photosynthesis when plants manufacture food through sunlight and water.
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