Statistics for great apes true or false?

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Question	Answer	% Correct
orangutangs are fast on ground	false	85%
gorillas are aggressiv animals	false	85%
when a male gorilla matures it is called a silverback	true	85%
there are chimps in south america	false	80%
humans are a part of the great ape species	true	80%
gorillas don`t climb much	true	70%
the fastest great ape is a gorilla	false	60%
in borneo male orangutangs will go down to the ground sometimes but not females	true	60%
humans are the only great ape that can easily swim	true	55%
all great ape species live in a complex social group	false	35%
chimps have better memory than humans	true	35%
chimps are 5 times stronger than humans	false	15%