there is inappropriate climatic condition and the land is not proper for living and Agriculture.
the answer is land bridges existed between the continents. alfred wegener originated the continental drift theory. according to theory, the world was a single compressed protocontinent initially and later drifted away to different continents as it is today. he called protocontinent as pangaea, means all lands. to support theory, he put forward another paper saying that a land bridge once existed between brazil and africa and so there are similar fossilised plants and animals in the two countries.
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