Their vital functions are the following: NUTRITION BEHAVIOUR REPRODUCTION
NUTRITION: let us get the substances we need to live. We get these substances from food and air. They are distributed throughout the whole body This function has various processes: DIGESTION RESPIRATION CIRCULATION EXCRETION
BEHAVIOUR: let us information about the world that surrounds us. It lets us relate to others. It includes too co-ordinating the functions of all the organs in the body. THE SENSES THE MOTOR SYSTEM NERVOUS SYSTEM all take part in this function.
REPRODUCTION: lets people have children REPRODUCTIVE SYSTEM is responsible for reproduction.
All Living creatures are made of CELLS. CELLS are the smallest units in the body. CELLS join to form TISSUES. TISSUES groups into ORGANS. ORGANS groups into SYSTEM. Each system is responsible for a specific FUNCTION