Q: Living species of chordates are classified into three major subphyla: vertebrata, urochordata, and what?


Read this paragraph and choose the correct option from the provided answers:

Living species of chordates are classified into three major subphyla: Vertebrata, Urochordata, and Cephalochordata. Vertebrates are all chordates that have a backbone. The other two subphyla are invertebrate chordates that lack a backbone.

 Choices:

- spirogyra

- invertebrates

- xerophyte

- cephalochordata


A:
cephalochordata