The given graph shows the amount of pollutants in four rivers W, X, Y and Z. The river that can support the least number of aquatic plants and
animals is river ________.
AW
BX
CY
DZ
The given graph shows the amount of pollutants in four rivers W, X, Y and Z. The river that can support the least number of aquatic plants and
animals is river ________.
AW
BX
CY
DZ