Answer:
Living organisms composed of many of the chemical elements, but most abundant elements include: hydrogen, carbon, nitrogen, sulfur, phosphorus and calcium.
Oxygen: It is the most abundant element in living organisms composing of 65% of the human body. Oxygen present in the body in the form of water which is used to generate energy.
Carbon: It is readily bound with other elements so it is needed for complex structure and function.
Hydrogen: It is the simplest structure which form bond with oxygen and form the water, which is the most crucial component for the most living organisms on earth.
Nitrogen: It is composing 80% of the air and earth. It is very important element in plant life, because nitrogen is readily absorbed and used by plant.
Sulfur: It is major component of 2 amino acids cysteine and methionine used by living organisms.
Phosphorus: It is the main element of the cell membrane which helping in the formation of phospholipids.
