旅鼠为什么要"死亡大迁移"?我认为之所以旅鼠要死亡大迁移,是因为屡鼠不懂得"计划生育",繁殖能力惊人,如果不自杀就会对自生构成威胁,在大自然的食物链中,由于旅鼠多,导致食物减少,旅鼠
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/28 20:04:23
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