Final answer:
The most abundant and essential elements on Earth that are also essential for life are hydrogen, oxygen, and carbon.
Step-by-step explanation:
The most abundant and essential elements on Earth that are also essential for life are hydrogen, oxygen, and carbon.
Hydrogen is the most abundant element in the universe and is a crucial component of water and organic compounds.
Oxygen, accounting for about 21% of Earth's atmosphere, is fundamental to the process of respiration and is a key element in many biological compounds.
Carbon is the backbone of organic molecules and forms the basis of all known life on Earth.
Learn more about elements essential for life on Earth