If you want a happy, healthy and long life you will need all your internal Organs to function properly. An organ is any distinct part of a human or animal or plant that has a characteristic shape and structure and performs a particular function in the organism's life.

The most important organ of the human or animal is the heart. The most important organ of a plant is the root. Several organs function together as an organ system. They need each other in order to work properly.







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