Amphibians are the first true tetrapods, or vertebrates with four limbs, and frogs are amphibians and ducks are aves. Given these facts, the first true tetrapods, or vertebrates with four limbs include among the following options:
- Schwinn
 - frogs
 - Man
 - insects
 - mammals
 - bats
 - Birds
 - feet


 

  frogs       