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protozoa

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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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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.
The Analysis of Mind by Russell, Bertrand View in context
 
 
 
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