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Fish is a category of animals, itself. There are two significant types of organisms that live in the world - Plants and Animals. Bascially, anything that breathes through lungs is an animal, and anything that has leaves and a stem is a plant. Very simple to tell apart. But telling different types of animals apart can be quite complex, despite the fact that it is only humans who have classified the animals under scientific terms for "convenience".

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16y ago

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