This phenomenon can be explained by the classification of these as carbon chains by the name of Carbohydrates.
Carbohydrates are biological molecules made primarily of carbon, with the presence of oxygen and hydrogen as well. These molecules are classified into three types:
- Monosaccharides
- Disaccharides
- Polysaccharides.
The best claim to support the statement that "cellulose, chitin, and starch are made from the same elements which are initially produced in photosynthesis" is that photosynthesis creates a polysaccharide known as glucose, which is present in the structural composition of each of these.
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