The document discusses nonvertebrate chordates and fish. It states that tunicates and lancelets are the two groups of nonvertebrate chordates. It defines chordates as animals that have a nerve cord, notochord, pharyngeal pouches and a tail extending past the anus. The document also notes that fish are aquatic vertebrates that mostly have paired fins, scales and gills, and that the evolution of jaws and paired fins were important developments for fish. It discusses adaptations for aquatic life in fish and classifies all living fish into three groups: jawless fish, cartilaginous fish, and bony fish based on their internal structure.
2. Nonvertibrate chordate The two groups of nonvertbrate chordates are tunicates and lancelets. tunicates lancelets
3. chordates A chordate is an animal that’s has, for at least some stage of its life, a dorsal, hollow nerve cord, a notochord, pharyngeal pouches, and a tail that extends beyond the anus.
4. What is a fish? Fishes are aquatic vertebrates, most fishes have paired fins, scales, and gills.
5. Evolution of fishes The evolution of jaws and the evolution of paired fins were important development during the rise of fishes.
6. Forms and function of in fishes Adaptations to aquatic life include various modes of feeding, specialized structures for gas exchange, and paired fins for locomotion.
7. Groups of fish When you consider their basic internal structure, all living fish can be classified into three groups: jawless fish, cartilaginous fish, and bony fish. jawless fish cartilaginous fish bony fish
