A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armour of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
A) legs
B) no jaws
C) an amniotic egg
D) endothermy

Question

Quizplus · Accepted Answer

The presence of external armour of bony plates suggests that this chordate may have no jaws, indicating that it is a jawless fish. The other characteristics listed (legs, amniotic egg, and endothermy) are not typical of aquatic chordates, so it is unlikely that this species would possess any of them.

A New Species of Aquatic Chordate Is Discovered That Closely