What is the most abundant of all vertebrate classes, and the most recent to evolve?

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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