Answered: Osteostracans are not included in the…

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter29: Vertebrates

Section: Chapter Questions

Problem 7RQ: Members of Chondrichthyes differ from members of Osteichthyes by having (a). jaw bony skeleton...

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Osteostracans are not included in the Gnathostome clade because [ Select ] ["They have heterocercal tails", "They lack jaws", "They have odontodes (true bone)"] . But they are considered the sister species of Gnathostomes because [ Select ] ["They have jaws", "They have odontodes (true bone)", "They have heterocercal tails"] and [ Select ] ["They have pectoral and pelvic fins", "They have pelvic fins only", "They have pectoral fins only"]

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