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Fishes and dolphins-same organs and similar general shape

How can fact which fishes and dolphins have same organs and similar general shape be explained?

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Fishes and dolphins have same organs and shape since though they have phylogenetically distant ancestors they face same environmental pressures because they share the similar habitat (water). So by undergoing genetic variability and natural selection a number of similar features, for illustration, the hydrodynamic body and the presence of fins, were in-corporate in these animals.

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