49．英国有一个小山村，村外的树林里栖息着两种颜色的桦尺蛾，树林里的小鸟以桦尺...

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50．为了探究水对种子萌发的影响，某研究人员设计了一个实验：在①和②两个花盆中...

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45．下面是人体吸入气体和呼出气体成分含量比较表，在“成分”一栏中，甲、乙、丙...

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显微镜是生命科学研究中使用的重要仪器，它能帮助人们观察肉眼无法看见的微小生物...

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72．下面为反射弧的组成示意图，下列说法正确的是

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69．观察下面两幅图，图中所反映的动物行为类型分别属于

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1648年，比利时科学家海尔蒙特把一棵重2．3千克的柳树种在装有90千克土壤的桶里，...

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小刚最近经常表现出精神不振、头晕、面色苍白等症状，他妈妈便带他到医院进行身体...

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下面是某生态系统中的食物链示意图，据图回答第54小题～第56小题。54．图中的①在...

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48．下图为男、女部分生殖器官的重量在发育过程中的变化曲线，据图可得出的结论是

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