Question

which of these is a possible effect of water pollution? intact food chains more favorable temperatures clearer water bioaccumulation of pollutants

Explanation:

Water pollution can lead to the bioaccumulation of pollutants. Pollutants in water can enter the food chain. Small organisms absorb these pollutants, and as larger organisms consume them, the concentration of pollutants increases (bioaccumulation). Intact food chains, more favorable temperatures, and clearer water are not typical effects of water pollution. Water pollution usually disrupts food chains, doesn't create more favorable temperatures (unless in specific industrial - cooling - related pollution but that's not a general case), and makes water less clear.

Answer:

bioaccumulation of pollutants