Amphibians are very sensitive to changes in their environment because their moist skins can absorb chemicals from pond water?

Since most amphibians are cold blooded they need to keep to a certain level of heat. And a certain level of coolness. So that why they are sensitive to the changes in the enviroment.

Improved Answer: Because their skins are delicate, and eggs lack shells, amphibians are especially senstive to their enviroment. - Science Book.