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Rachel Gidden

Blume ch 12.3

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