Respiration : is the process by which living things, use oxygen to break down sugar to obtain energy.

Nutrition : the biochemical and physiological process by which living things use food to support their life. Plants are autotrophs, obtain food by the process of photosynthesis using sunlight,water and carbon dioxide. Animals are heterotrophs, obtain food by eating plants and other animals.

Metabolism : is the sum of all chemical reactions that takes place inside the cell. Excretion : The process by which living things eliminate waste products of metabolism out of the cell. Example, Urea is an excretory product of liver cells removed by kidney cells.

Irritability : is the reaction of an organism to changes in the external environment.

Movement : is the mobility of an organism from place to place. It is the characteristic feature of animals.

Reproduction : is the process by which living things produce offsprings for the survivial of their species.

Growth : is the process by which living things increase in size