Which organism among the following does not have a backbone?

Bat

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Cheetah

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Squirrel

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Earthworm

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Solution

The correct option is D Earthworm
Earthworms are invertebrates, which means they do not have a backbone. In fact, they don't have any kind of bones, legs, eyes, or teeth. Squirrel, bat and cheetah are vertebrates and so have backbones.

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