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protozoa
(redirected from protozoan)

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protozoa

Group 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).

Xenophyophores are giant protozoa that measure 20 cm/8 in in diameter and live on the deep-ocean floor.
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