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Chapter 13: Introduction to Animals
Reef Ball Development Group
Are you interested in artificial coral reefs? This site includes underwater photographs of reefs built using reef balls and links to sites about other types of artificial reefs. How do
you think reef balls compare to other types of artificial reefs?
Parasitic Roundworm
Diseases
At this site you can find out all about the parasitic roundworms that infect humans, including hookworms and pinworms, and how you can protect yourself from becoming infected.
