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Wednesday, 27 June 2012

Which group of animal is called 'The first mammals'?

Protozoa are called 'the first mammals'.They are minute organisms made up of only one cell,and form the lowest major division or phylum of the animal kingdom.
Protozoa are very tiny and generally you cannot see them without a microscope. sometimes though,they appear in such huge numbers so that they are visible.The green scum you see on top of stagnant ponds are actually a type of protozoa.

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