Explain the difference between one celled organisms and many celled organisms?
The differences between one-celled (or unicellular) and many-celled (or multicellular) organisms:
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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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.