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, it will probably have which of the following characteristics?
A) legs
B) no jaws
C) an amniotic egg
D) endothermy
Answer: B
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Biology
- Which era is known as the "age of reptiles"?
- Why is the amniotic egg considered an important evolutionary breakthrough?
- Which of these are amniotes?
- What should be true of fossils of the earliest tetrapods?
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- The swim bladder of ray-finned fishes
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- Which of these statements accurately describes a similarity between sharks and ray-finned fishes?
- To which of the following are the scales of chondrichthyans most closely related in a structural sense?
- Which of these might have been observed in the common ancestor of chondrichthyans and osteichthyans?
- Jaws first occurred in which extant group of fishes?
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- Which of the following statements would be least acceptable to most zoologists?
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