Ddt:
a. does not decompose quickly
b. is still used today
c. kills insects and bacteria
d. all the above

d. it does all of that and even harms humans to some extent

let me know if its right

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.