Animals

Which small sea animal is considered to be a link between vertebrates and invertebrates?

More Questions from Animals
Which of these animals is a rodent?
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What is the feeding structure found in sea urchins?
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Which animal has more than one heart?
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Which creature is deaf?
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Which of these animals saves food for another meal time?
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Which of the following has naturally pricked ears?
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The Saharan striped polecat is a member of which family?
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Which is the most common species of bird in the world?
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