Fact 1: Amphibians are the first true tetrapods, or vertebrates with four limbs.

Fact 2: Frogs are classified as amphibians.

Given the two facts above, answer the question "_ are tetrapods." with the following options: 
- animals
 - amoeba
 - Frogs
 - Length
 - insects
 - Spiders
 - Snakes
 - Birds


 

   Frogs      