Chordates & Fishes

3. scales teeth with scales and feel like sandpaper
4. dorsoventrally flattened fish
7. an opening where the digestive reproductive and urinary systems combine
12. flexible rod-shaped supporting struture
13. finned fish fins streched over bony/spiky spines
16. line system detects change in sound, touch, pressure, or other distortions
17. fin unpaired fin on the back of a shark
19. has secrete slim as a defense mechanism
20. upper chamber

1. lower chamber
2. bladder gas filled sac in most bony fishes
5. fin another term for tail fin
6. structure that closes or covers an aperture
8. invertebrate that resembles a fish but has no jaws or organs
9. flat bodies with eyes and mouth on their underside
10. finned fish fleshy fins joined to the body by a single bone
11. 2 heart chambers
14. parasite with rows of teeth to suck blood
15. fin fins on each side to help control the direction
18. squirt marine tunicate with a body where water flows in and out of central pharynx