Answer: it's unclear why marsupials thrived in Australia. however one plan is that once times were powerful, marsupial mothers might jettison any developing babies they'd in their pouches, whereas mammals had to attend till gestation was over, defrayment precious resources on their young, Beck said.
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Because the Ohio River flowed westward, it became a convenient means of westward movement by pioneers traveling from western Pennsylvania.
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To establish trade relationships, explore new lands, and increased China's influence.
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Under admiral Zheng He, China got hold over the Indian Ocean in the 15th century. He went to several expeditions and opened trading connection with South Asia. In Asia, he conducted trade in south Asia by exporting silk and porcelain in return for other goods. Silk during the early years recognised as a luxury thing and worn by the aristocracy, including emperors and nobles.
Andrew Johnson
I hope this helps!