The multicellular eukaryotic organism that lacks cell walls and is a
heterotroph belongs in kingdom is Animalia.
Animalia are known as heterotrophs as they get their energy from plants and animals and are unable to manufacture food.
Animalia also lacks cell wall because it isn't needed in its cell structure. Cell
walls are found in plants and help to provide rigidity and support to them.
This makes animals to be more flexible and are able to perform various
forms of movement.
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