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    the southern Hemisphere 40 million years ago.
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    the southern Hemisphere 40 million years ago.

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    lived 50 million years ago
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    lived 50 million years ago

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    trong muscular system to support underwater movement
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    trong muscular system to support underwater movement

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    and was found in what is now Pakistan.
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    and was found in what is now Pakistan.

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    structural changes to adapt to underwater life
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    structural changes to adapt to underwater life

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    which is a rare major turning event in the evolutionary history.
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    which is a rare major turning event in the evolutionary history.

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    The ancestors of cetaceans returned to the ocean 250 million years
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    The ancestors of cetaceans returned to the ocean 250 million years

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    n the evolutionary history of species
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    n the evolutionary history of species

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    Scientists know more about Pakicetus
    0:40

    Scientists know more about Pakicetus

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    which was separated from ruminants 60 million years ago
    0:49

    which was separated from ruminants 60 million years ago

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    f whale and hippopotamus is a semi-aquatic omnivore,
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    f whale and hippopotamus is a semi-aquatic omnivore,

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    rely on the echolocation function; Some species are
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    rely on the echolocation function; Some species are

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    In general, the body size
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    In general, the body size

    species of baleen whales.
    0:37

    species of baleen whales.

    The nostrils are raised on top
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    The nostrils are raised on top

    entered the water 50 million years ago
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    entered the water 50 million years ago

    Cetacea
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    Cetacea