Ozone, it was found, was actually causing scar tissue to form in the animals' alveoli, tiny bulbous structures in the lungs where oxygen is absorbed into the blood and carbon dioxide is released.
(it; was found; T:Ozone) (oxygen; is absorbed; into the blood and carbon dioxide; L:the lungs)
it oxygen
was found is absorbed
T:Ozone
into the blood and carbon dioxide L:the lungs