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fish have...to protect them
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When they sense danger they fill their stomachs with water (or air if they are out of water). This exposes sharp spines that cover their bodies. This makes them less inviting for predators to catch. Their skin and some internal organs contain tetrodotoxins, which are highly toxic substances.
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Hey mate!
Here's your answer:-
Fish have slippery scales on their bodies. These scales protect the fish and also help in easy movement through water.
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