how many types of animal species are there in the world?, 8.7million, 7.4million, 2.5million, What is the Shortest river in the world?, Lena, Roe, Poe, Ombala, What is the longest river in the world?, Nile, Amazon, Congo, Lena, How many Mountains are there in the world?, 1,187,049, 2,519,761, 1,230,076, 2,142,846

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