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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
What 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 of them are___.   free- living organisms  
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what 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.   plants, fresh  
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Planarians can reproduce in two ways. What are they.   Sexually, and asexually  
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___are parasites with a complex life cycle that requires more than one hoot.   Flukes  
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Most flukes reproduce how?   sexually  
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Flukes cause a disease that is potentially a fatal blood disease in humans. What is it?   Schistosomiasis  
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___are parasites that live in the intestines of a host cell.   Tapeworms  
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Tapeworms absorb food digested by the what?   host  
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What do tapeworms produce that contains sperm and eggs?   body segments  
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The fertilized eggs in Tapeworms pass out of the host's body and can enter through another__.   host  
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Flatworms were probably the first animal to have what type of symmetry?   bilateral  
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they were also the first to have___, nerves in the head region, and a___tissue layer that develops into the organs and systems.   senses, third  
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Roundworms are also called___.   nematodes  
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they are extremely abundant, live in a variety of______, and have two body openings-- a_____and an___   environments, mouth and anus  
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Roundworms appeared early in animal evolution, but scientists are not sure how they___.   evolved  
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A lot of roundworms are plant and animal_____; roundworms can cause____in humans.   parasites, trichinosis  
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Some roundworms are beneficial because they kill___.   other pests  
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Roundworms are essential in developing healthy___.   soil  
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Created by: rgidden
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