47. Which of the following mechanisms is essential for animal navigation?
(A) a time keeping mechanism
(B) a color recognition mechanism
(C) a scent recognition mechanism
(D) a sound discrimination mechanism
(E) a touch discrimination mechanism
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動物的定位1.太陽or北極星位置2晝夜節...
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正確答案是 **(A) 時間保持機制**...
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