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What is the distinction between vertebrates and invertebrates?

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Ctenoid type

Cycloid type

Placoid type

Absent

answer is D.

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Detailed Solution

The Cyclostomata class is distinguished by a circular mouth that lacks jaws. They have horny teeth that can be retracted. In addition, these members of the class lack scales and fins. They have no mucus glands on their skin and are ectoparasites.

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