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What is the most primitive group of fishes and what is the defining characteristics of animals in this group?
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What is the most primitive group of fishes and what is the defining characteristics of animals in this group?

User Helder
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Answer:

Superclass Agnatha.

The fishes in this group don't have jaws. Their mouths are like a holes in their heads and lack of movements.

Step-by-step explanation:

User Grackkle
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