Dolphins, porpoises, and whales all are in the group of marine animals known as cetaceans. Scientists saw many close similarities in the DNA sequences of whales and dolphins. This observation is proof of whales and dolphins both evolved from a relatively recent common ancestor.
Cetacean are members of an aquatic group of mammals commonly known as whales, dolphins, and porpoises.
The ancient Greeks stated that cetaceans can breathe air, give birth to live young, produce milk, and have hair. These are all features of mammals.
As the scientist observed the close similarities in the DNA sequences of both the whales and the dolphins. This shows the proof that whales and dolphins both evolved from a relatively recent common ancestor.
Thus, this is the evidence to reveal the reason behind the similarities in DNA sequences in whale and dolphin.
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