You are presented with the question "The first true tetrapods, or vertebrates with four limbs include" and the following answer choices: 
- Schwinn
 - frogs
 - Man
 - insects
 - mammals
 - bats
 - Birds
 - feet

Now knowing that amphibians are the first true tetrapods, or vertebrates with four limbs and frogs are amphibians and ducks are aves, choose the best answer.


 

  frogs       