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Blume Ch 12.3

What are worms? Invertebrates with soft bodies, bilateral symmetry, and three tissue layers organized into organs and organ systems.
Flatworms are usually parasites, but a few are ___________ organisms. Free-living
What are Planarians? Free-living flatworms that feed on small organisms or dead bodies of larger organisms.
Planarians can _______ asexually or sexually; they lay ____. reproduce. eggs.
What are flukes? Parasites with a complex life cycle that requires more than one host.
Most flukes reproduce ______ Sexually.
Flukes can cause _________________, a potentially fatal blood clause. Schistosomiasis.
What are tapeworms? Parasites that live in the intestines of a host animal.
Tapeworms absorb food digested by the ____. Hosts.
Tapeworms produce body ________ that contain sperm and eggs. Segments.
The fertilized eggs pass out of the host's body and can_____ another host. Enter.
Flatworms were probably the first animals to have ________ symmetry, ____ and nerves in the head region, and a ____tissue layer that develops into organs and systems. Bilateral. Senses. Third.
Roundworms, also called _______, are extremely abundant, live in a variety of environments, and have two body openings- a mouth and an _____. Nematodes. Anus.
_______ appeared early in animal evolution, but scientists are not sure how they evolved. Roundworms.
Many roundworms are plant and animal _______; roundworms can cause _____ in humans. Parasites. Trichinosis.
Some roundworms are beneficial because they kill ______. Pests.
Roundworms are essential in developing healthy ______. Soil.
Created by: kamillecote