i. Mammals
require constant supply of energy to maintain their high body temperature.
ii. Due to this they have high energy
need. This energy is supplied through oxygen rich blood.
iii. Therefore oxygenated and deoxygenated
blood should not mix with each other.
iv. In mammal's heart, these two types of
bloods are separated by the septum in the heart and thus they have highly
efficient supply of oxygen to the body.
