In the more complex chordates, what does the dorsal nerve cord eventually become?

Organisms that have backbones

All chordates are vertebrates.

Which of the following are chordates that are invertebrates?

Invertebrate chordates. Live similar to sponges but are more complex.

Invertebrate chordates that like to buddy up on a chain. Similar to jellyfish but are more complex.

Invertebrate chordates that look like tadpoles. These organisms closely resemble the ancestors of vertebrates.

Larvaceans trap their food in clouds made of ________.

How do larvacean mucous clouds benefit other organisms?

Invertebrate chordates that closely resemble vertebrates. Live partially buried in the sand and look like fish.

Vertebrates are chordates that have spines.

Most vertebrates are predators.

It is believed that _______ and ________ represent ancestors of bony fish and sharks.

Lampreys and hagfish are the simplest marine vertebrates. They are also _________.