Why are amphibians a good early warning device for water pollution

Amphibians start to die when their is water pollution. They rely on water or moist environments to survive. This tells us that their must be water pollution. They wouldn't just randomly die.

my hamster died and my second hamster i got after that one died as well. i also lost two birds named rainbow and kiwi, (they didn't die, they flew off and escaped). i lost a cat named omi, and a dog named snoopie. the best way i got over it is, paying my respects, and just thinking that they were in a happy place. as well as just remembering but not thinking about it all the time, just do fun activities and try not to think about it too much. hope you feel better. i'm sorry about your loss. : (

the right answer is: time