several bivalves, a shilllp several herbivorous gastropod varieties. L for daily

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several bivalves, a shilllp several herbivorous gastropod varieties. L for daily feedings of copepods and feeder fish 8) Parrotfish have mouths adapted to scrape algae off a coral and can even munch corals rapidly died in their place would be shards of... 2 A) chitin B) calcium carbonate The teacher wanted to demonstrate that some of the invertebrates possess a closed circulat ould remove and dissect a.. silica ory system. The teacher D) cartilage A) polychaete B) bivalve C) sea star D) shrimp remained. If the teacher used a aquarium started to die one by one, only the undamaged shells 0) The bivalves in the issecting microscope to examine the external surfaces of the empty arks left by shells of the bivalves, the teacher would probably see A) jaws nema C) tube feet D) radulae finned fish from the ocean and notices that attached to its flank is an equally long, snakelike organism. The attached organism has no extermal segmentation, no scales, a round mouth surround small eyes. Emil thinks it might be a marine leech, a hagfish, or a lamprey. What feature excludes it from potentially being a leech? A) its lack of scales B) its elongate shape C) its external sucker D) its lack of external segmentation 12) If the snakelike organism turned out to be a hagfish, why should Emil throw the ray-finned fish he caught overboard rather than making dinner from it? A) It has mucous on its skin. B) The fish was probably sick or dying, otherwise the hagfisht would not have attacked it. C) Hagfish inject paralytic neurotoxins. D) If it had an ectoparasite it must also have endoparasites. 13) You are shown an interesting female burrowing mammal preserved in a jar of alcohol at a museum. You observe it has two tiny eyes that are difficult to see and seemingly covered by skin as well as enlarged front paws with enlarged claws for digging. What might you look for to distinguish whether it was a pouched or placental mole? A) a synapsid skull B) a cleithrum C) a backwards facing marsupium D) a quadrate-articular type jaw joint 14) You discovered a fossil bird in Jurassic rocks that appears very closely related to Archaeopteryx. You note it has feathers and teeth. You also note a few other characters that make it different from modern birds. These characters might be 1. a long feathered tail. 2. fingers with claws extending from the wings. 3. scaly clawed hind feet. 4. hollow bones 5. air sacs connected by tubes to the lungs 6. no urinary bladder ?) 3 and 4 C) 5 and 6 D) none of the characters listed above 15) You are digging for fossils in Jurassic rocks and unearth a complete skeleton of a fossil synapsid. You are undecided, at first, whether the animal was a mammal or a more primitive mammal-like cynodont. Which characters listed below would help you decide? A) The fossil has seven neck vertebrae. B) The fossil has a single lower jawbone and three ear bones. C) The fossil has specialized teeth D) At least two of the characters listed above would be decisive

Explanation / Answer

9. polychaete

10. tube feet

11. lack of scale

12. hang fish inject paralytic neurotoxic

13. a quadrate articular type jaw joint

14. 1 and 2

15. the fossil has specialized teeth

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