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People have long known that elephants are extremely intelligent and very social creatures. But many scientists
remained doubtful that the animals could solve particularly complex tasks. Researchers in Thailand performed an
experiment to test elephants' ability to work together. To access a food reward, two elephants had to pull each
end of a rope at the same time. If they pulled only one end, the rope would come to them, but the food would
not. Six pairs of elephants were tested 40 times over two days, and every pair discovered how to acquire the
food
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The elephants demonstrated
A indignation
В
obedience
Ccooperation
D
aggressiveness