Question

Next to air, which is the most important substance, responsible for sustaining life on Earth?

Answer 1

Next to air, water (${\mathrm{H}}_2\mathrm{O}$) is the most essential substance, responsible for sustaining life on Earth.

• The deficiency of water in the human body results in dehydration, which can be accompanied by kidney failure, seizures, and swelling in the brain.
• It helps in improving the circulation of oxygen throughout the human body.
• Water also helps in the digestion of food in the digestive system.
• Water helps in the breakdown of food as it is an important component of saliva.
• The excretion of waste in the human body requires water.