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Blume Ch 12.3

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
_____ are invertebrates with soft bodies, bilateral symmetry, and three tissue layers organized into organs and organ systems.   Worms  
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Flatworms are usually parasites, but a few are _____ ______ organisms.   free living  
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__________ are free-living flatworms that feed on small organisms or dead bodies of larger organisms.   Planarians  
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Most planarians live under rocks, on _____ material, or in _____ water.   plant; fresh  
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Planarians can _________ asexually or sexually; they lay eggs.   reproduce  
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______ are parasites with a complex life cycle that requires more than one host.   Flukes  
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Most flukes reproduce ________.   sexually.  
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Flukes cause ____________, a potentially fatal blood disease in humans.   schistosoma  
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_________ are parasites that live in the intestines of a host animal.   Tapeworms  
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Tapeworms absorb food digested by the ____.   host.  
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Tapeworms produce body ________ that contain sperm and egg.   segments  
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The fertilized eggs pass out of the host's body and can ___ another host.   eat  
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Flatworms were probably the first animals to have _________ symmetry.   bilateral  
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______ and nerves in the head region, and a _____ tissue layer that develops into organs and systems.   Senses; third  
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Roundworms, also called _________ are extremely abundant, live in a variety of environments, and have two body openings--a mouth and an anus.   nematodes  
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Roundworms appeared ______ in animal evolution, but scientists are not sure how they evolved.   early  
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Many roundworms are plant and animal _________; roundworms can cause trichinosis in humans.   parasites  
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Some roundworms are beneficial because they kill _____.   pests.  
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Roundworms are essential in developing healthy ____.   soil.  
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Created by: gmei
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