A salamander and a trout can both survive up to pH level of 5 but why is the salamander less likely to die if the amount of acid rainfall in the region increases

 Beginning in the 1970s and 80s, acid precipitation has impacted the Adirondacks ... Acidification is caused by emissions of sulfur dioxide and nitrogen oxide from the ... Like many amphibians, red-backed salamanders do not have lungs; instead, they ... According to studies, increasing soil acidity due to acid rain

Explanation:

They do not have lungs.

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