Formation of tissues: A group of similar cells sometimes group together and can-y out the same functions. This group of cells forms tissues and tissue system. Their function is to help transportation and to provide balance and support to animal bodies. The cells in a tissue are not identical, but they work together to accomplish specific functions.
Formation of organs: A group of tissues performing a particular function is called an organ. For example: root, leaves, flowers etc. Similarly, eyes, nose, face, hand, leg, heart, liver, speen, kidney, Lung etc. are different organs of animals. The body’s functions are conducted by organs. Each organ is a recognizable structure (for example, the heart, lungs, liver, eyes, and stomach) that performs specific functions.