题目内容
The evolutionary complexity of creatures can be examined in terms of stages.
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Puzzles offer a reliable way to find out a particular level of a mammal's brain power in problem-solving.
Ants learn to go through a maze of passages very easily.
Rats are faster learners than most college students.
Mental ability tests are given to animals to determine particular levels at which they can think about soemthing that is not around.
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