Noteworthy Points of the Chapter:
1. The process of exchange of O2 from the atmosphere with CO2 produced by cells is called breathing.
2. Mechanisms of breathing varies among different groups of animals depending mainly on their habitat and level of organisation.
3. Branchial respiration is through gills and pulmonary respiration is through lungs.
4. Amphibians, reptiles, birds and mammals respire through lungs.
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