What is the most abundant of all vertebrate classes, and the most recent to evolve?
- Correct Answer: mammals
- bony fishes
- reptiles
- birds
Explanation: Of all vertebrate classes, birds are the most numerous, even though they evolved most recently. Why have birds been so successful? The answer is flight. Being able to fly opened up a whole new world to birds: the world of the air above the land and water.
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