SI worksheet 1///0 13
Which of the following groups represents the most basal lineage of vertebrates? a. Hagfish b. Conodonts c. Lampreys d. Sharks e. None of the above The first vertebrates to live on land were _____. a. Mammals b. Conodonts c. Reptiles d. Chondrichthyans e. Amphibians Which of the following sets of animals contains only gnathostomes? a. Lampreys, Conodonts, and hagfish b. Conodonts, placoderms, and acanthodians c. Sharks, hagfish, and whales d. Rays, turtles, pigeons, and tuna e. Hagfish, bass, sharks and frogs The gill flap, or operculum, was an important adaptation for fish because it helps with _____. a. Sensing vibrations in the water b. Sensing chemicals in the water c. Maintaining a supply of oxygen d. Adjusting buoyancy e. Underwater reproduction According to one hypothesis how did jaws evolve in Gnathostomes? What is the “lateral line system?” What is missing in a lamprey’s cartilaginous skeleton that is present in most other cartilage seen in nature? What is the function of the “spiral valve?” Define the following terms and give an example of an animal for each type: Oviparous -­‐ Ovoviviparous -­‐ Viviparous – In sharks the excratory system, digestive tract, and reproductive tract empty into a common opening called the… How are ray-­‐finned fishes able to maintain buoyancy underwater? Based on the length of the intestine how can you tell if a fish is an herbivore or a carnivore?