Carbon, phosphorous, nitrogen, hydrogen, oxygen, sulfur
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.
Zinc is not typically found as a major element in living systems. Carbon and nitrogen are both essential elements found in all living organisms, but zinc is generally required in trace amounts as a micronutrient for specific biological functions.
The element that is most abundant in living things is carbon. The other five elements that are most abundant in living things are hydrogen, nitrogen, oxygen, phosphorus and sulfur.
Hydrogen
The sixth most abundant element on earth is carbon. It can be found in various forms, including graphite in pencils, diamonds in jewelry, and in organic compounds in living organisms and fossil fuels.
Carbon is the element most associated with living things and is found in all four macromolecule types (carbohydrates, lipids, proteins, and nucleic acids). Carbon's versatility in forming covalent bonds allows for the vast diversity of organic compounds found in living organisms.
The most common element found in all living things is not, as you would think, oxygen. It is carbon an can be found in every living organism. That is why organic material gives of Carbon and Oxygen as it rots or burns.
carbon and water
Water is the most abundant molecule found in living organisms. It is essential for life processes such as hydration, temperature regulation, and biochemical reactions.
Selenium is not a common element but is necessary.
Water is the most abundant compound found in living systems, making up approximately 70% of the total weight of most living organisms.
hydrogen