Pakicetus is an ancient wolf-like organism that lived 50 million year ago. It had wolf-like ears and nostrits on the front of its skull Modem whales have a similar ear structure, but their nostrils are on the back of their skull. Aetiocetus lived 25 million years ago, had the same ear structure as both Pakicetus and modern whales, but nostrils in the middle of its skull. According to this information, the most likely conclusion that biologists could draw about the retationship of Aetiocetus to the other organisms is that Aetiocetus O evolved as whale ancestors lost their forward-placed nostrits through disuse. O is the ancestor of both Pakicetus and modern whales. O is not related to elither Pakicetus or modern whales. is a transitional form between Pakicetus and modern whales

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Marine Evolution

Marine habitat is less explored, and hence, its biological diversity is far less known. The marine habitats are not constant due to their shifting nature, while the terrestrial habitats are more stable. Marine biology is the science that deals with the study of diverse marine species, their interactions, and behavioral characteristics.