Oxygen burns hydrogen in the living system, releasing the energy that runs living beings.
Catalase Catalase
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.
carbon
The physical environment is important to living organisms because a healthy environment is needed to thrive. The ecosystem is made of many organisms that depend on each other. Each organism plays a role in maintaining the health of the environment.
I dont know ask your teacher
Living organisms have a huge role. They no not produce however they can save the ozone.
Hydrogen
An organisms niche is an organisms particular role, or how it makes its living
to be cool
water
If you mean element-wise, living organisms contain mostly carbon, oxygen, hydrogen.
An organisms niche is an organisms particular role, or how it makes its living
Carbon and hydrogen
Catalase Catalase
oxygen hydrogen and carbon
The predominant elements in living organisms are the four CHON elements; Carbon, Hydrogen, Oxygen and Nitrogen.
Hydrogen