6. Choose the best answer. Mass migration into
has led to poor water quality
for most of Brazil.

refugee camps

haciendas

industries

cities

The continents of africa and south america used to "fit together” like puzzle pieces. about how far back in time would you have to go to find the formation of the atlantic ocean? 600 million years 430 million years 200 million years 90 million years

There are 25 elements found in living things. how many of these elements are found in some organisms but not all? 1 , 6 , 19 , 25

What greek scientist created a screw to move water for irrigation?