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When the Isthmus of ____ formed, north and ____ america became ____ and the ocean habitat became ____ isolated. This meant the population of the ____ ancestors will have been separated into two populations that were ____ from each other. The ____ conditions on each side of the isthmus will have been ____. There will have been genetic ____ in the two populations and new ____ may have occurred that were ____. The fish with the ____ most suited to the environment will have been more likely to ____ and ____. Their ____ will have inherited the ____ for these characteristics. Eventually, the two populations became so different, due to natural ____, that they could no longer ____ to produce ____ offspring. They would have ____.

speciation Isthmus of Panama

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