The Reptile Clade Includes Five, Extant Groups: Tuataras, Snakes and Lizards

question 96

Multiple Choice

The reptile clade includes five, extant groups: tuataras, snakes and lizards, turtles, crocodilians, and birds. When you compare current textbooks with older textbooks, you notice that in older textbooks, birds were not included with reptiles.
-Based on current research data on birds and reptiles, what would be the most obvious reason(s) for the earlier classification?

• A)Birds are endotherms and the other lineages are ectotherms.
• B)Birds had feathers and could fly.
• C)Birds have no teeth and smaller skulls.
• D)Birds' eggs are very different from reptilian eggs.
• E)Both A and B are correct.

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