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Unicellular organisms are composed of a single cell. Multicellular organisms are composed of many specialized cells. Specialized cells differ in structure (size, shape...) and function (the role they perform in the organism).
An organism, which are composed of only one single cell and are smaller and simpler when compared to multicellular organism. Unicellular organisms carry out all specialized functions within a single cell. The lives, which cannot be seen with the naked eye, are unicellular organisms. Examples of unicellular organism. A multi cellular organisms includes all organisms from Plantae and Animalia kingdoms-fish, man, tiger, horse, cow, dog, sheep, snakes, whale, elephant, mango tree, rose, plant, herbs, etc. Examples of multicellular organism.