The skin of amphibians is moist and not very thick. It is lined with many blood vessels. Oxygen is able to pass through the skin and be asborbed directly into the blood vessels. There are some small salamanders (in the family Plethodontidae) do not even have lungs and breath always through their skin!
Since the oxygen is dissolved in an aqueous film on the skin and passes from there to the blood, the skin must remain moist at all times. Because it must stay moist, this makes frogs susceptible to many toxins in the environment. Some of these toxins could dissolve in the layer of water and be passed into their bloodstream.
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