In which substance do the molecules have the strongest attractions to one another?
a. sugar, a solid
c. sulfuric acid, a liquid
b. hydrogen, a gas
d. water, a liquid

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.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).