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The need for a transport system in multicellular organisms.
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| Submitted: Mon Apr 19 2004
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The need for a transport system in multicellular organisms Unicellular Organism Although most organisms are made of many different types of cells, all of which work together, some organisms are just one, single cell. Biologists refer to this type of organisms as unicellular. All unicellular organisms are able to reproduce themselves without help of other organisms, as opposed to viruses. Bacteria, for example, are unicellular organisms, which can even move forward. There are also unicellular organisms (even a few bacteria), which use photosynthesis to support themselves. Just like large animals have organs to perform specific functions, unicellular organisms have specialized organelles. Unicellular organisms are a very varied bunch. Some are smaller than others or are more complex, have more interesting names, or can live in very hostile environments. Unicellular organisms were probably the first form of life that appeared on earth. Today they have an important place in all ecosystems and in most high multicellular...
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