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Questions and Answers
Which structure is present in all chordate embryos?
Which structure is present in all chordate embryos?
- Dorsal nerve cord
- Pharyngeal clefts
- Post-anal tail
- Notochord (correct)
What is a distinctive feature of chondrichthyans?
What is a distinctive feature of chondrichthyans?
- Paired lateral fins
- Bony plates
- Mostly cartilaginous endoskeleton (correct)
- Suspension-feeding mode of nutrition
According to one hypothesis, what did the jaws of vertebrates derive from?
According to one hypothesis, what did the jaws of vertebrates derive from?
- Notochord
- Post-anal tail
- Calcified cartilage
- Skeletal rods that had supported pharyngeal slits (correct)
Which of these characteristics are observed in the common ancestor of chondrichthyans and osteichthyans?
Which of these characteristics are observed in the common ancestor of chondrichthyans and osteichthyans?
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What is a longitudinal, flexible rod located between the digestive tube and the nerve cord in chordate embryos?
What is a longitudinal, flexible rod located between the digestive tube and the nerve cord in chordate embryos?
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