PLEASE HELP NEED AN ANSWER ASAP PICTURES BELOW
Two graphs above show a catalytic reaction, which color of balls represents a catalyst?
Select one:
a. Purple
b. Blue
c. Red
d. Green

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.