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Paragraph Comprehension

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Question 1 of 11

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Question 1

A desert biome generally receives less than 50 centimeters of rainfall in a year. The driest of all terrestrial biomes, the desert biome covers approximately 20% of the Earth. Temperatures vary tremendously, evaporation is huge and vegetation, perhaps obviously, is drought-resistant.

According to the paragraph, how much of the Earth does the desert biome cover?

50%

20%

5%

Unknown.