They all lay eggs. They all have feathers. They all have a backbone. They are all warm-blooded.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Lamar learned that birds, mammals, and reptiles are all vertebrates. Which characteristic do all vertebrates share?
Possibilities:
- They all lay eggs.
- They all have feathers.
- They all have a backbone.
- They are all warm-blooded.

They all have a backbone.