Amphibians are the first true tetrapods, or vertebrates with four limbs, and bullfrogs eat other amphibians. Given these facts, these belong to the class of creature that were the first true tetrapods: among the following options:
- millipede
 - crabs
 - four limbs
 - bullfrogs
 - gastropod
 - a fish
 - warm-blooded
 - insects


 

    bullfrogs     