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The cells of living things are made mainly of four elements: carbon, hydrogen, oxygen and nitrogen. They make up 96% of the atoms that are in living things, so they would be considered major chemicals.However, depending on how you define major, other elements that only make up a few percent of cells can top the list.he cells of living things are made mainly of four elements: carbon, hydrogen, oxygen and nitrogen. They make up 96% of the atoms that are in living things, so they would be considered major chemicals.
All cells except bacterial cells have a distinct nucleus that contains the cell's DNA as well as other structures like mitochondria and the endoplasmic reticulum. The main source of energy for all of the biological processes that take place within a cell is ATP. See more at eukaryote, prokaryote.