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What are the characteristics of a fish?

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1. Fish are mostly ectothermic.
2. They have gill slits which they use to breathe by drawing out oxygen from the water around them.
3. All fish are vertebrates.
4. Most are covered in scales while some can be covered in skin.
5. Their limbs end in fins and not in digits. Although some fishes do not actually have any limbs.
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