Question

First vertebrates animals belongs to class

• A. Ostracodermi
• B. Cyclostomata
• C. Placodermi
• D. Osteichthyes

Answer 1

The correct option is A Ostracodermi

Ostracoderms refers to the armored jawless fishes of the Paleozoic era. They lived in what is now North America, Europe, and Russia from the Middle Silurian to Upper Devonian. They were the first fish to use gills just for respiration. This is the first class of vertebrates.

So, the correct answer is option A.