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Hi bro /siso plss post in the English Hope it helpfull too
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the answer is a
Explanation:
old faithful in Yellowstone
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Emission from fossil fuels can cause a lot of toxic air pollution. The air pollution can lead to an increase in respiratory diseases such as lung disease and lung cancer. Sulfur dioxide (SO2), for example, is emitted from burning coal and leads to an increase in acid rain. These are just a few examples of the harmful effects of fossil fuels.
The reason oceans and rivers are barriers are because they can prevent trade, they might form natural barriers between places, and they can be difficult to navigate across. The reasons they are roadways is because they can be used to get from one place to another very fast, can help with trading, and can get you someplace you might otherwise not have been able to reaching.
