Enter your Name:   Enter your E-mail Address:  Define the following terms: 01a. Demersal 01b. Chromatophores 01c. Hermaphroditism 01d. Oviparous 01e. Viviparous 02. The members of class Agnatha are characterized by features they do not have. Name two of these features. 03. Some birds and marine mammals are considered by scientists to be very "advanced" because of their remarkable ability to migrate from one area of the world to the other without ever having been shown the way. How could you refute this statement by using the lamprey as an example? 04. A fish has a jaw, but its skeleton contains no osteocytes or osteoblasts. Is it a lamprey, a ray, or a bony fish? 05. The design of rays is perfect for their demersal life style. Name two characteristics helpful to these fish. 06. What external feature on a bony fish ensures that the water flows across the gills so as to maximize the amount of oxygen that gets into the capillaries of the gills? 07. What special feature does a bony fish have that aids in its ability to rise in the water column? 08. Name at least three physical features of a bony fish that distinguish it from a cartilaginous fish. 09. A fish has a large, dark spot near its tail. Is this an example of camouflage, disguise, or advertisement? 10. Explain the purpose of the spiral intestine in sharks. 11. What is the name for the specialized system of blood flow in the gills of fishes? 12. What are the lateral line and ampullae of Lorenzini in sharks? 13. Explain the difference between anadromous behavior and catadromous behavior in fishes. 14. A certain fish produces only a few eggs for fertilization. Is this fish most likely oviparous or ovoviviparous? 15. Identify the structures pointed out in the diagram below: