Pollution causes a lot of breathing problems.
Explanation:
- Breathe: This is a verb and doesn't fit the context of the sentence, which requires a noun.
- Breathing: This is a gerund form of the verb "breathe" and works well in the sentence to describe the type of problems caused by pollution.
- Breath: This is a noun that refers to the air taken into or expelled from the lungs during respiration. While it's related to the process of breathing, "breathing" is a more appropriate choice to describe the problems caused by pollution.
- Breather: This is a noun that typically refers to a short rest or break. It doesn't fit the context of the sentence, which is discussing health problems related to pollution. "Breathing" is the correct choice.
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