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Learn with Curious George how all fish can breathe underwater. He shows you tiny fish to giant eels. All of them need oxygen to keep their bodies moving.

The first fish came to be about 530 million years ago. They did not look like the fish we see today. They grew and changed over a very long period of time. The first fish didn’t have any jaws. Jawed fish evolved 100 million years after the first fish. Fish are thought to be the first animals that had a backbone.

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Making Connections


Have you ever seen fish gills up close? Where were you when you saw them?


Have you read any other books about fish? Did you learn anything that wasn’t in this book?


Fish breathe with their gills. What parts of the body help humans breathe?

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