According to a current hypothesis, jaws evolved from what structures? skeletal rods supporting the pharyngeal (or gill) slits in the anterior end of an early gnathostome fish the middle ear bones of early mammals the slime glands of early hagfishes lungs Question 30 (2 points) Which two groups of animals possess an amniotic egg? ray-finned fish and amphibians amphibians and reptiles sharks and rays reptiles and mammals
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How did the origin of jaws, lungs, limbs, and the amnion affect the course of vertebrate evolution?
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1. What are the four chordate shared characteristics (synapomorphies) and what is the function of each structure for a chordate animal? 2. The evolution of jaws is considered to be a key innovation in vertebrate evolution. What advantage do jawed vertebrates (gnathostomes) have when compared to jawless fishes (agnathan, hagfish, and lamprey)? 3. What groups of vertebrates have an amniotic egg? What advantage do amniotes have over non-amniote vertebrates (e.g. fishes and amphibians)? 4. How did the origin of jaws, lungs, limbs, and the amniotic eggs affect the course of vertebrate evolution?
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