Answer:
Food, transportation and it also can affect by the pororoca. que é uma onda de grande proporção que se forma a partir do encontro das águas oceânicas com as águas do rio.
Step-by-step explanation:
Food and transportation : the river have big biodiversity and local people use to go fishing there. They also use the river to go to other places with ships. The pororoca is a huge wave that has it formation by the meeting of the oceanic water with the amazon river's water.