... many organ systems." (How to know the Protozoa, page 3) Consequently, I will attempt to address the above proposition through the use of comparisons between different types of Protozoa and a more in depth analysis of varying levels of complexity. As a general rule, Protozoa are characterised as being enclosed within one cellular unit although it should be noted that this alone does not necessarily result in restriction of complexity. Whilst most protozoa are microscopic, size range varies, for example, Leishmania donovani, 1-4 µ to Mycetozoida plasmodia, several feet long. (How to know protozoa (T. Jahn), pp 12). Although Protozoa lack tissue differentiation, variation exists regarding the organisation of Protozoan structures between species. Some species do not show this characteristic e.g. Chaos carolinensis, a giant free-living amoeba, and Opalina, but cytoplasm is often divided by cell membrane. Structures that do exist allow metabolic functions and Protozoan life to exist. The large number ...

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