Answer the following question given this paragraph: 

Caecilians are most closely related to salamanders. As you can see from Figure below , they have a long, worm-like body without legs. Caecilians evolved from a tetrapod ancestor, but they lost their legs during the course of their evolution.


Q: What ancestors did caecillians evolve from?

 Choices:

- ornithopod

- arthropod

- hominid

- tetrapod

A:
tetrapod
