Animals

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

More Questions from Animals
Which species are considered "very fast runners"?
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What are black and white bears from China called?
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What is a female cat called?
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Which animal is included in the Chinese zodiac?
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Which primate, from the mountains of Japan, keeps warm in winter by bathing in hot volcanic springs?
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Which animal can change its colors to blend in to the environment?
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What animal is considered to be the first non-human to acquire human language?
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Which dinosaur is thought to have been able to fly?
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