Question

how will flow of acid rain into a river make the survival of aquatic life in the river difficult

Answer 1

aCID rain is harmful for aquative animal because the rain water contain many harmful component like co,co2,n2 etc which dissolve in water so the concentration of oxygen became less . SO the aquatic aminals not respirate properly  

Answer 2

The flow of acid rain into rivers lowers the pH of water bodies.

Aquatic organisms can live only in a certain range of pH.

Therefore,lowering the pH would affect their lives