A because none of the others could be correct if you think about them
They differ by the number of neutrons.
Products that start a new reaction are released would be the best of these choices
The Earth has three main climate zones: tropical, temperate, and polar.
Air pollution can also have a direct effect on water pollution. When particles like sulfur dioxide get high into the air they can combine with rain to produce acid rain. Acid rain can turn lakes acidic, killing fishes and other animals.