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Blume Ch 12.3
Question | Answer |
---|---|
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. |