Why do humans have to be multicellular and not single

Humans have too many body functions to be unicellular

Multicellular organisms are those which are made up of many cells. Humans are multicellular. Multicellular organisms can be much larger and more complex. This is because the cells of the organism have specialised into many different types of cells such as nerve cells, blood cells, muscle cells all performing different functions.

Hope this helps.

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