Question

All living organisms need ____________ for respiration.

Answer 1

• The process in which Oxygen combines with food to form Carbon dioxide, Water vapour, and releases energy is called respiration.
• $\mathrm{Food}+\mathrm{Oxygen}\to \mathrm{Carbon}\mathrm{dioxide}+\mathrm{Water}\mathrm{vapor}+\mathrm{Energy}$

Therefore, all living organisms need oxygen for respiration.