How did the breakup of pangaea affect land organisms during the mesozoic era?

In the beginning all the continents were joined together as a single landmass called pangea. Later on account of geological changes, especially movements of crustal plates below the surface of earth, huge land masses broke off and drifted apart from one another. The seas separated them and acted as barrier to the free movement of organisms among the continents.

Explanation:

Because of variable environmental conditions prevailing on the different continents, over centuries, plants and animals evolved independently in each biogeographical region.

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