Fact 1: Birds are endothermic tetrapod vertebrates.

Fact 2: Bird A bird is an animal with feathers.

Given the two facts above, answer the question "What is an endothermic tetrapod vertebrates?" with the following options: 
- warm-blooded
 - passenger pigeons
 - remains of prehistoric life
 - Humans
 - An animal with feathers.
 - All animals with vertebrae.
 - Dogs.
 - They have thick fur


 

     An animal with feathers.    