When ocean levels dropped about 70 million years ago,marsupial mammals moved into North America and displaced many of the placental mammal species.

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Marsupial mammals moved into North America from South America during the Cenozoic era, not because ocean levels dropped 70 million years ago. The major migrations and displacements of mammal species, including the interchange between North and South American faunas, occurred much later, primarily due to the formation of the Isthmus of Panama around 3 million years ago, rather than due to changes in ocean levels 70 million years ago.

When Ocean Levels Dropped About 70 Million Years Ago,marsupial Mammals