How do multicellular organisms differ from unicellular organisms?
Unicellular organisms are single celled and self sufficient. They can survive without the help of other cells. They are complex as the cell is complex. Many people consider them simple creatures. Multicellular organisms are composed of many cells and there is usually some for of division of labor among the cell eg. tissue, organs, organ systems. A multicellular organisms is much more complex since there is an interdependence of cells making up their body. Their cells seem to be more specialized in a way as to complement the entire organism. Their cells have lost their independence and cannot live alone out side the organism. The entire organism depends upon the health of all its cells to survive. Nerve cells cannot do what muscle cells can do functionally. In a single celled organism they have the mechanisms to move, reproduce, sense the environment all in one.
