some soils are more sensitive than others to a lowered what
p53 HPV CO2 wolf population light level pH sea level dam
A B C D E F G H
Some soils are more sensitive than others to the acid dropped by air pollution.
some soils are more sensitive than others to a lowered pH
some soils are more sensitive than others to a lowered what (A) p53 (B) HPV (C) CO2 (D) wolf population (E) light level (F) pH (G) sea level (H) dam