Answer:
When two or more different tissues group together to perform a function is called Multi cellular organism.
Step-by-step explanation:
- Every living organism contain one or more cells.
- Those organisms which perform its function with the help of single cell are called Unicellular Organism. For example- Amoeba contain single cell through which they perform locomotion, reproduction etc.
- Organisms that are formed by more than one cell which form tissue and division of labour takes place.This type of organisms are called as multi cellular organism. For example, Human is the large multi cellular animal that contain many cells that form tissue and tissues together form organs. Thus a complex organisation takes place.
- For example, epithelial tissues that are found in skin surface, reproductive tract, inner digestive tract perform functions like secretion, excretion,absorption etc.