Question

How the body organisation of unicellular animal is referred as organisation?

Answer 1

The arrangement of specialized parts within a living thing is sometimes referred to as levels of organization. Cells, of course, are the first level of organization. In any multicellular organism, cells rarely work alone. Cells that are similar in structure and function are usually joined together to form tissues.

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Answer 2

In a cellular organism, a single cell performs all the functions.
All the work is divided among the cell organelles.
But in multicellular organisms the different organs perform different functions.