If motility is considered a characteristic of animals, then why are stationary creatures like sponges still considered to be animals?

Name: If motility is considered a characteristic of animals, then why are stationary creatures like sponges still considered to be animals?
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The Answer of If motility is considered a characteristic of animals, then why are stationary creatures like sponges still considered to be animals?

If Motility Is Considered a Characteristic of Animals, Then Why