what is the difference between unicellular and multicellular
multi-cellular: an organism with 2 or more Cells (multi = many). A multicellular organism is an organism made up of more than one Cell, such as you, me, dogs, cats, birds, bugs, etc. They are complex. They are much much bigger than unicellular organisms and have more body functions. A unicellular organism (also called single cell organism) is an organism made up of only one Cell. Algae, some types of fungus, and bacteria are some examples. These organisms are not very complex, and all their body functions are carried out in that single tiny Cell.