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年轮

时间：2021-09-05 04:59 关键词：鱼纲生物学

答案解析

<p> 鱼体由于体内营养物质摄食状况不同呈现周期性有规律的生长，在鳞片表面留下鳞嵴变化痕迹，每年形成一个宽窄相间的生长带，即为年轮。</p>

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