Have North and South America always been connected by Central America? Once the two continents joined, plants

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Have North and South America always been connected by Central America? Once the two continents joined, plants and animals could move from one to the other; animals can walk, fly or swim, but how does a plant species spread from one area to another? South America has thousands of plants adapted to the Amazon Rainforest; do you think it is likely that any of those plants will be able to migrate to North America across the deserts of Mexico, Texas, and Arizona?

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