某生物兴趣小组 为探究鲫鱼适应水中生活的特征,设计如下实验方案:取2条大小、形...
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人的耳垂性状由一对基因控制,有耳垂是显性(由B基因控制),没有耳垂是隐性(由b 基...
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71.下面为细胞分裂和分化过程示意图,在①②③④四个过程中,表示细胞分化的是
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70.为探究影响玉米生长的环境因素,某同学选择生长状况相仿的多株玉米幼苗,随机...
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69.右面为蚕豆种子的胚的结构示意图,种子萌发后,能发育成根的结构是
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64.下面是植物细胞和动物细胞的结构模式图,为细胞生命活动控制中心的结构是
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下面为人体消化系统部分结构示意图,据图回答第57~58题。57.消化食物和吸收营养...
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下面为人体泌尿系统组成模式图,据图回答第55~56题 。55.图示中能暂时贮存尿液的...
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54.某班级在制作人口腔上皮细胞临时装片的实验过程中,出现了三种盖上盖玻片的操...
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