20.3 Jawless Fishes (Class Cephalaspidomorphi) 13. What is an ammocoete? What is
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Question
20.3 Jawless Fishes (Class Cephalaspidomorphi) 13. What is an ammocoete? What is its possible significance to the evolution of vertebes? 14. How do lampreys differ from other vertebrates? 20.4 Cartilaginous Fishes (Class Chondrichthyes) 15. Explain how the adaptations of cartilaginous fishes make them better predators. 20.5 Bony Fishes (Class Osteichthyes) 16. Identify this vertebrate structure. What do the rings represent? (24x). 20.7 Reptiles (Class Reptilia) 7. Describe an amniotic egg What is its evolutionary significance?Explanation / Answer
Answer:
Answer:
The larval stage shows metamorphosis that starts with change in head region. Endostyle differentiates into thyroid gland, oral hood into buccal, teeth, tongue & mouth. Dorsal fin changes into dorsal and a caudal fin. Lamprey migrates from river to the open ocean/sea and becomes carnivorous.
These are the skin scales (cycloid or ctenoid) that grows with the fishes. The rings on these scales are used to determine the age of fish.
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