*plse*the partial pressure of oxygen inside the lung (alveolar air) is usually kpa and the partial pressure of oxygen in the adjacent pulmonary blood is kpa.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

hope this any more questions i am here plz mark brainliest