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What are gill slits?

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What are gill slits?

Gill slits are the vertical openings on either side of the animal with gills that allow water to follow over the gills so the respiratory system can extract oxygen from the water. Most sharks have five gill slits, but more prehistoric species have six and seven.

All About Sharks: A Complete Guide to the World's Most Misunderstood Predator by Blaise Jones
All About Sharks: A Complete Guide to the World’s Most Misunderstood Predator by Blaise Jones

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