The Amazon River basin boasts the largest river system on Earth and harbors an ecosystem that is tremendously complex. Early travelers from renaissance Europe were overwhelmed by their first encounters. In 1531, Francisco Pizarro overthrew the Incan empire, removing the emperor from his throne and taking for Spain the Incan imperial treasures. A decade later his younger brother ventured east from the high plateau of the Andes Mountains in pursuit of the famous cities of gold and spices thought to be hidden in the jungle forest. Going down the river the expedition soon exhausted its supplies and a small group was sent ahead to search for food. Eight months later, this group emerged at the mouth of the Amazon, having made what would prove to be the first descent of the length of the river.
A missionary who accompanied the group sent a remarkable account of their adventures to the Pope, including mention of the great signal drums that sounded from village to village far in a
A. in searching for food
B. going down the river
C. proving the length of the river
D. covering the length of the Amazon River
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