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Enchanted Learning All About Sharks! |
 Geologic Time Chart |
| Introduction to Sharks | Introduction to Rays | Anatomy | Shark and Ray Species | Extreme Sharks | Extinct Sharks | Classification | Shark Glossary | Shark Index | Printables, Worksheets, and Activities |
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, basking shark
, and the megamouth shark) expel the filtered water through their gills.
Some sharks have spiracles, which are special gill slits located just behind the eyes. They supply oxygen directly to the eyes and brain of the shark. Bottom dwelling sharks like the angelsharks
use this extra respiratory organ to breathe while at rest on the sea floor. It is also used for respiration when the shark's mouth is used for eating.
have been found "sleeping" in sea caves in the Gulf of Mexico, completely stationary for long periods of time.
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