Which country is the largest emitter of greenhouse gases?
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Which of the following is the most common water pollutant?
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Which of the following is the largest terrestrial biome on Earth?
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Which renewable energy source is the most widely used globally?
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Which of the following is the most common air pollutant?
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Which of the following is the most diverse ecosystem on Earth?
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Which of the following is the correct syntax for an if-else statement in PHP?
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Which of the following is the correct way to concatenate two strings in PHP?
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Which keyword is used to define a function in PHP?
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