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gia mei(:

Blume Ch 12.3

_____ 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 are _____ ______ organisms. free living
__________ 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. plant; fresh
Planarians can _________ asexually or sexually; they lay eggs. reproduce
______ are parasites with a complex life cycle that requires more than one host. Flukes
Most flukes reproduce ________. sexually.
Flukes cause ____________, a potentially fatal blood disease in humans. schistosoma
_________ are parasites that live in the intestines of a host animal. Tapeworms
Tapeworms absorb food digested by the ____. host.
Tapeworms produce body ________ that contain sperm and egg. segments
The fertilized eggs pass out of the host's body and can ___ another host. eat
Flatworms were probably the first animals to have _________ symmetry. bilateral
______ and nerves in the head region, and a _____ tissue layer that develops into organs and systems. Senses; third
Roundworms, also called _________ are extremely abundant, live in a variety of environments, and have two body openings--a mouth and an anus. nematodes
Roundworms appeared ______ in animal evolution, but scientists are not sure how they evolved. early
Many roundworms are plant and animal _________; roundworms can cause trichinosis in humans. parasites
Some roundworms are beneficial because they kill _____. pests.
Roundworms are essential in developing healthy ____. soil.
Created by: gmei