All of us have seen fish. They are very elegant in their colouration and many people like to keep them as pets. A fish may be identified as an aquatic vertebrate animal whose body may or may not be covered by scales and bears two sets of paired fins and many unpaired fins. fish are cold blooded or ectothermic animals which mean that their body temperature keeps on changing with the temperature of water. fish are distributed in all aquatic habitats ranging from the mountain streams to the
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