| Answer Key Worms, Mollusks, and More | |
| 1. Describe the mollusks. Are they colorful? Do they appear to move? | |
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Answer: Students should note the bright colors of the various mollusks and that they are obviously soft and some have shells. They do not appear to move.
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| 2. Find two mollusks that contain shells that you have collected at the beach or seen in a store or museum. Describe the animal that lived in those shells. | |
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Answer: Students should list two types of shelled mollusks and describe where they found those shells. They should describe their thoughts about the mollusks that lived within those shells.
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| 3. Describe how the octopus gets out of the box. | |
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Answer: The octopus first sticks his legs through the hole and then squeezes the rest of his body through the tiny hole.
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| 4. Describe how this octopus moves around and how it captures its prey. | |
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Answer: The octopus creeps and crawls over the coral and rocks stalking his prey and then he captures it by surrounding it with its tentacles.
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| 5. In the video clip with the squid jetting itself forward, which way has the squid gone? You may need to watch the video a few times; the action is very rapid. Describe how the squid has accomplished this. | |
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Answer: The squid actually moves to the left, leaving a cloud of ink in its wake. The squid takes in water through its mantle, which then traps the water and then contracts to blow out a forceful jet-like explosion of water, which then propels the squid forward.
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| 6. Which worm do you find to be the most interesting? Describe it. | |
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Answer: Students should describe any of the worms that they find interesting (planarian, leeches, tapeworms, earthworms, tubeworms).
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| 7. Look closely at the picture of the Northern sea star. What do you notice? What do you think happened? | |
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Answer: This sea star only has three full arms and two tiny new ones are regenerating. The sea star may have been bitten by a predator or may have been stuck under a rock.
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| 8. Describe how the sea star captures and eats its prey. | |
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Answer: The sea star uses its tube feet to move towards and then climb onto the prey, usually some sort of non-moving bivalve. The muscular sea star uses its tube feet to suction onto the shells and then pull them apart. The sea star then inserts its sac-like stomach into the mollusk, secreting digestive enzymes that rapidly break down the mollusks soft interior. The food is sucked back into the sea star along with its stomach.
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| 9. Describe at least three arthropods that you have observed either at school or at home. | |
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Answer: Answers will vary depending upon location. Students in northern areas might note the various spiders they see indoors during the winter. Students who live in coastal areas might mention crabs and lobsters near the beach. Ants, flies, butterflies, etc. are all acceptable suggestions as well.
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