Why are the flora and fauna of North and South America so different?

1. Both continents are located at different latitudes, which means the climate will be different.

2. Once Eurasia and North America were connected by an isthmus and there is more similar flora and fauna, but at the same time South America was an island for a significant part of the Tertiary period, and was isolated, and the Isthmus of Panama was formed much later, so there are different inhabitants.



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