Kingdom Protista
The organisms of Kingdom Protista are made of eukaryotic cells. They are unicellular, or multicellular with no specialised tissue.
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They live in any environment that has water, and most are photosynthetic. Some species are heterotrophic. Organisms such as algae and protozoa belong to this kingdom.
Two ways of feeding inside one kingdom
Algae are autotrophs — they make food by photosynthesis. Protozoa are heterotrophs — they go and find it. Protista is the unusual group that holds both.
Algae by colour
The algae of Kingdom Protista are grouped by their external colour — green, brown, red and the diatoms. Red algae have very large bodies, so "protists are microscopic" is not always true.
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