Animals

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

More Questions from Animals
Which creature squirts blood from its eyes at its attackers?
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Which insect greatly assists in plant pollenation?
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Why do beavers gnaw, chew, and chop nearly all the time?
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What do you call a group of geese flying together?
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Generally, what shape is the top of a squid's head?
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Which of the following animals is a mammal?
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Which common garden bird has the Latin name "Troglodytes Troglodytes"?
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Which type of sea creature can be a mako or bull?
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