Today, plants that once were found only in the Americas account for of the world’s food supply.

The answer is *One third* hope I helped ^^

the right answer is the constitution

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."