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1. Which Which group is the comm 2. group is the common ancestor of all the other groups on the chart? stem reptiles Whath Wh
Birds Crocodilians Lizards Snakes Turtles Mammals - PRESENT Stegosaurs Tyrannosaur Sauropods Pterosaurs Icthyosaurs TIME Thec
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Answer #1

1. stem reptiles is the common ancestor of all group organisms.

2. Icthyosaurs, pterosaurs, tyrannosaurs, sauropods and stegosaurs are the groups which became extinct without leaving progenies.

3.Birds, crocodilians, lizards, turtles and mammals are the groups which survived until present.

4. Lizards and snakes are most closely related , having a common ancestor and taken least time in evolution.

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