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Why are whales not grouped in fishes ?...

Why are whales not grouped in fishes ?

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Whales look likes fishes. They can swim in water like them but they are not fish as they respire with lungs, have four chambered heart, diaphragm, mammary gland, hairs, etc. Whales are viviparous like any other mammal.
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LAKHMIR SINGH & MANJIT KAUR-DIVERSITY IN LIVING ORGANISMS-Diversity In Living Organisms
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