Compounds pure substances made of two or more types of and are

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.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a