What are the four predominant elements in biology?

Answer:Carbon, Hydrogen, Oxygen and Nitrogen.

Explanation:

They make up 96% of the atoms that are in living things, so they would be considered major chemicals.

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.