Answer:
A breath
Explanation:
When you breathe in you have to let out said breath
Toxic water quality in the Klamath River is a direct result of both upper basin agricultural development (the draining of wetlands and intense chemical use), and the presence of PacifiCorp's dams, creating warm, stagnant pools for algae to develop. Massive algae pools in Upper Klamath Lake.
The answer is the salivary gland.
Saliva is secreted through the surface of the tongue.<span />