All About Sharks From Tooth To Tail 鯊魚知識百科 pdf epub mobi txt 電子書 下載 2024


All About Sharks From Tooth To Tail 鯊魚知識百科

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Adrienne Mason
2005-12
38
32.50元
9780439808842

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发表于2024-12-29

All About Sharks From Tooth To Tail 鯊魚知識百科 epub 下載 mobi 下載 pdf 下載 txt 電子書 下載 2024

All About Sharks From Tooth To Tail 鯊魚知識百科 epub 下載 mobi 下載 pdf 下載 txt 電子書 下載 2024

All About Sharks From Tooth To Tail 鯊魚知識百科 pdf epub mobi txt 電子書 下載 2024



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The Inside Scoop on Sharks

Blood, guts, muscles, and more… that’s what’s inside a shark. Like all animals, sharks have a brain, heart, stomach, intestines, and other organs. But they have some parts that are different, too.

Vertebral Column: A shark’s backbone extends into the top part of its tail fin. This stiff fin helps sharks speed through the water!

Brain: A shark’s brain controls all of a shark’s actions, just like how your brain controls your actions. A lot of a shark’s brain is used for its senses, including smell and sight. You’ll learn more about a shark’s super senses on pages 23 and 24.

Liver: A shark’s liver is filled with oil. Oil is lighter than water, so a shark’s large liver helps it stay afloat.

Gills: Sharks use blood-filled gills to absorb oxygen out of the water.

Hot Blood or Cold?

Most fish, and most sharks, have blood that is the same temperature as the water around them. So, if the water is cold, their blood is cold. Five kinds of sharks, including great white sharks, like Bruce, have warm blood like you do. These fast-swimming sharks hold onto some of the heat produced by their powerful muscles.

Breathing like a shark

Like all fish, sharks get the oxygen they need from the water. Water flows in through their mouth, across their gills, and out through five to seven gill slits. Blood in their gills draws oxygen out of the water.

Sharks that live on the ocean floor, like nurse sharks, bring water to their gills through holes on the top of their head. This way, their gills aren’t clogged with sand or mud.

All About Sharks From Tooth To Tail 鯊魚知識百科 下載 mobi epub pdf txt 電子書

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