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1.Left behind rich silt when it flooded which allowed farmers to grow a surplus of food that civilization could develop

2.provided steady, reliable water source across Northern India

3.it was an important marine trade route since the Era of the coastal sailing vessels

4.an important through way for transport of crude oil to Europe, north amaerica and east asia

5.it can provide development opportunities such as mining

Explanation:

the last part should be because they provide resources that will help them create a civilization

as the maasai legends tell, "in the beginning of the world, enkai was the only god: the guardian of rain, fertility, sun, and love. with that love, enkai birthed three sons." solución

it affected it because the kingdoms (with trade) slowly got richer and richer.