Complete the sentence about Rio Negro with the correct year: In ______ German scientist Alexander von Humboldt and French botanist Aimé Bonpland explored the river.

Answer and explanation

Correct answer: A. 1800

  1. Step 1: In 1800 German scientist Alexander von Humboldt and French botanist Aimé Bonpland explored the river. Answer: 1800. Why not the others: 1825, 1797 and 1830 don't fit.

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