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Explain the difference between one celled organisms and many celled organisms?

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The differences between one-celled (or unicellular) and many-celled (or multicellular) organisms:

                                                   Unicellular                                               Multicellular

1) Nomenclature:                  Also called Prokaryotes                            also called Eukaryotes

2) Origin history                   first life forms on planet                            evolved much later

3) Example                ...

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estudy | Student

In addition to the above two answers, multicellular organisms show division of labour i.e. they have specialised tissues and cells for specific functions and processes. While in unicellular organisms like amoeba just one cell carries out all the basic processes of life like growth, metabolism, reproduction etc.

iamkaori | Student

Unicellular organisms can survive without the help of other cells since their only cell is so complex. Multicellular organisms are much more complex since there are many cells that make up their body, and these cells are dependent on each other. Their cells are more specialised and thus different, while unicellular organisms have all functions in one cell. Multicellular organisms also depend on the health of all its cells to survive.