The shared anatomical and behavioral characteristics that reflect common ancestry between birds and crocodiles. Also, explain the reason, for which dinosaurs also shared these traits. Introduction: The diapsid lineage of amniotes is Archosaurs. The living representatives of this class include crocodilians and birds. The extinct members of the group are dinosaurs and pterosaurs. The ancestor for these three members of the group is common. Hence, the probability of some common traits being shared among these members is higher.

Question

On a research expedition to the Galapagos, you and your research team discover four new species! All the animals appear to be chordates, but each animal has distinct traits: Animal A: Both vertebral column and jaws Animal B: Vertebral column, jaws, limbs and lays amniotic eggs (amniote) Animal C: Vertebral column Animal D: Vertebral column, jaws and limbs A. Identify four derived characteristics that all chordates share. B. Based on your understanding of phylogeny, map the animals and their traits onto the phylogenetic tree provided below. In your response, list each number (1-8) and indicate which trait or animal corresponds to that position on the phylogenetic tree.

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Chapter 32, Problem 14TYK

Summary Introduction

To review:

The shared anatomical and behavioral characteristics that reflect common ancestry between birds and crocodiles. Also, explain the reason, for which dinosaurs also shared these traits.

Introduction:

The diapsid lineage of amniotes is Archosaurs. The living representatives of this class include crocodilians and birds. The extinct members of the group are dinosaurs and pterosaurs. The ancestor for these three members of the group is common. Hence, the probability of some common traits being shared among these members is higher.

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