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The [?] kingdom is also [?] and very [?] and includes beings as diverse as protozoa and algae.
Protozoa
Protozoa are [?] beings with [?] cells which [?] off organic matter or other unicellular beings. They live in the sea and in [?] and are considerably bigger than bacteria. For example a paramecia is a tenth of a [?] long and can be seen with the naked eye. Protozoa are very active and they move using different, special parts of their cells.

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Algae
Algae can be unicellular or [?] but they never have real tissues. They are [?] beings, they produce their own food in the same way as plants. They live in both sea water and fresh water. There are many different kinds of algae. Unicellular algae are tiny and multicellular algae may be several metres long.