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If an organism is multicellular, heterotrophic (cannot make its own energy), and has no cell wall, it is an animal. This is the definition of the kingdom Animalia.

There are unicellular animal-like members of the kingdom Protista commonly called protozoa.

Fungi are heterotrophic and multicellular, but they have a cell wall made of chitin.

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Q: How do you determine whether an organism is an animal?
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