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protozoa |
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protozoaGroup of single-celled organisms without rigid cell walls. Some, such as amoeba, ingest other cells, but most are saprotrophs or parasites. The group is polyphyletic (containing organisms which have different evolutionary origins).
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In attempting to understand the elements out of which mental phenomena are compounded, it is of the greatest importance to remember that from the protozoa to man there is nowhere a very wide gap either in structure or in behaviour. |
| Hutchinson Encyclopedia |
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