Express 250 mg in grams, or how many grams are equal to 250 mg

pee pee

Explanation:

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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.