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Alexis Young1

Blume Ch 12.3

What are invertebrates with soft bodies, bilateral symmetry, and three tissue layers organized into organs and organ systems? Worm
What are usually parasites, but few are free-living organisms. Flatworms
What are free-living flatworms that feed on small organisms or dead bodies of larger organisms? Planarians
Where do most planarians live? Under rocks, on plant material, or in freshwater water
How can planarians reproduce? Sexually or Asexually
What are parasites with complex life cycle that requires more than one host? Flukes
How do flukes reproduce? sexually
Flukes cause _________ a potentially fatal blood disease, in humans. Schistosomiasis
What are parasites that live in the intestines of a host animal? Tapeworms
Tapeworms absorb food digested by ______. Host
Tapeworms produce what that contains sperm and eggs? Segments
What were probably the first animals to have bilateral symmetry, senses and nerves in the head region, and a third tissue layer that develops into organs and systems? Flatworms
What are roundworms also called? Nematodes
Many roundworms are plant and animal parasites; roundworms can cause _________ in humans. trichinosis
Worms are divided into what two types? flatworms and roundworms
T or F: All worms are invertebrates with four tissue layers. False
What are types of parasite flatworms? Tapeworms and flukes
Planarians are _______ flatworms. free-living
How are some roundworms beneficial? They kill pests
Roundworms are essential in developing what? Healthy Soil
The fertilized eggs pass out of the host's body and can ______ another host. enter
Roundworms appear _____ in animal evolution, but scientists are not sure how they evolved. early
Roundworms were the first group of animals to evolve a digestive system with a _______ and an ______. mouth and anus
________ attack dogs, are parasites. Heartworms
How does a tapeworm eat? Tapeworms attach themselves in a host's intestine & asrobe food the host has digested.
What is the most widespread human disease caused by flukes? Schistosomiasis
List three ways roundworms are helpful to humans. 1. They help fight insects 2. May be used to kill ticks that cause Lyme disease 3. Help provide healthy soil
Created by: ayoung1