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Another group among the eukaryotes are the algae. They only live in seawater or freshwater where they carry out photosynthesis, i.e. they use sunlight to produce energy. A lot of different types of algae can be found.
Explanation for children:
Algae are another group among the eukaryotes. They can be large or small (microalgae) and only live in seawater or freshwater. Our terrestrial plants probably come from such algae. Algae can also perform photosynthesis, which means they use sunlight to produce energy.