Varieties of elements called differ from one another only in number of neutrons and therefore in atomic mass.

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

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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.