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附圖是同一種生態系中,甲、乙兩種動物的族群大小變化圖,由圖中可知,甲、乙間的關係是屬於下列何者?
互利共生
片利共生
捕食和被捕食
兩者沒有任何關係
由附圖的食物網判斷,下列哪兩者之間不是競爭的關係?
鼠和松鼠
蝗蟲和麻雀
鼠和蝗蟲
老鷹和松鼠
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