A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, which of the following characteristics is it most likely to exhibit?

Question

Quizplus · Accepted Answer

The described characteristics match those of ancient jawless fishes, known as ostracoderms, which did not have jaws. Legs, amniotic eggs, and endothermy are traits associated with more advanced or different lineages of vertebrates.

A New Species of Aquatic Chordate Is Discovered That Closely