Question

digestive tract and the nerve cord. their main purpose is to support the digestive tract. pharyngeal slits can be found in the pharynx of humans and fish.

it is widely believed that most animals in phylum chordata are vertebrates that evolved from what?

chordates.

vertebrates.

invertebrates.

Explanation:

In the evolutionary history of chordates, vertebrates (a major group within Phylum Chordata) are believed to have evolved from invertebrate chordates (which are also part of Phylum Chordata but lack a vertebral column). The other options are incorrect: evolving from "chordates" is circular (as vertebrates are chordates), and evolving from "vertebrates" would be illogical as it would imply evolving from the same group they are a part of in a non - progressive evolutionary sense.

Answer:

C. invertebrates.