BioD BioG FORM_1 - EAS 1700 Worksheet YOUR NAME FOSSILS:...

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EAS 1700 Worksheet Y OUR N AME ……………………………………… F OSSILS : B IODIVERSITY AND B IOGEOGRAPHY E XERCISE 1: T HE “G REAT A MERICAN I NTERCHANGE AS A “N ATURAL E XPERIMENT IN M ASS E XTINCTION (Four questions @ 5 points = 20 points total) Until the Pliocene, when the Isthmus of Panama formed, North and South America had been isolated from one another for tens of millions of years and had completely different land- mammal faunas. Once the isthmus formed, mammals migrated from one continent to the other in what is known as the Great American Interchange . A. Let us suppose for the sake of argument that North and South America were originally islands of equal area which became joined together as one. (This is about right.) Let us suppose also that the land-mammal species on both continents were entirely different species. (A good assumption because species ordinarily last no longer than a few million years, and indeed a fairly accurate assumption in this particular case.) Let us suppose
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BioD BioG FORM_1 - EAS 1700 Worksheet YOUR NAME FOSSILS:...

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