Which sample contains a total of 3.0 x 1023 molecules? a) 14 grams of nitrogen gas
b) 14 grams of lithium
c) 4 grams of hydrogen gas
d) 4 grams of helium

d. temperate deciduous forest

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

let that person have a turn to speak : )