If you ment A living organism, then no it isn't. But I'm sure you ment in living organisms. Then yes, it is an important element found in most organisms and is used for a great range of functions. One example would be pH regulation in the blood, or any other liquid.
No, hydrogen is not a living organism. It is a chemical element that is the simplest and most abundant element in the universe. It is a fundamental building block of matter but does not exhibit characteristics of living organisms.
Oxygen burns hydrogen in the living system, releasing the energy that runs living beings.
Catalase Catalase
carbon
The four most common elements in living things are carbon, hydrogen, oxygen, and nitrogen. These elements are essential for building organic molecules like carbohydrates, lipids, proteins, and nucleic acids that make up living organisms.
consist of organisms and the non living things.
Oxygen burns hydrogen in the living system, releasing the energy that runs living beings.
Hydrogen
water
If you mean element-wise, living organisms contain mostly carbon, oxygen, hydrogen.
Carbon and hydrogen
Catalase Catalase
oxygen hydrogen and carbon
Hydrogen
Hydrogen
Carbon, hydrogen, nitrogen and oxygen
oxygen,carbon,phosphorus,potassium,sulfer, hydrogen
carbon, hydrogen, oxygen, nitrogen, calcium, phosphorus