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In a single-celled organism (Unicellular organism), one cell carries out all the functions of the body. For example, transporting nutrients, excretion ,etc are performed by the single cell which makes up the organism.

In a multi-cellular organism, on the other hand, various cells arrange or group themselves to perform certain or particular functions. They are specialized to perform any one type of function. This is what makes up tissues, organs and ogran systems in a multi-cellular organism. One group of cells performs one function. For example, blood corpuscles are of different types. One type (WBCs) helps in fighting diseases, another type (RBCs) will help in transporting oxygen to various cells and so on.

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