Why are the elements carbon, hydrogen, oxygen, and nitrogen important for sustaining life on Earth?

Carbon, hydrogen, oxygen, and nitrogen are important for sustaining life on Earth because they are essential elements found in all living organisms. Carbon is the building block of organic molecules, hydrogen and oxygen are crucial for energy production and cellular processes, and nitrogen is necessary for the formation of proteins and DNA. These elements play key roles in the structure and function of living organisms, making them vital for life as we know it.