Answer the following question given this paragraph: 

Vertebrates are animals that have a backbone. All of them are placed in the Phylum Chordata. Modern vertebrates include fish, amphibians, reptiles, birds, and mammals. Only about 5 percent of animal species are vertebrates.


Q: What do we call animals that have a backbone and belong to the phylum chordata?

 Choices:

- organelles

- mammals

- invertebrates

- vertebrates

A:
vertebrates
