一般说来，生物种类不会由于一个个体死亡而导致该物种的绝灭。这是因为生物体具有[]A．遗传特性B．生殖作用C．生长现象D．应激性-七年级生物

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• 地球不断有生物灭绝的现象发生，是[]A．上帝的安排B．与人类无关C．完全是由人类引起的D．一种自然现象-七年级生物
• 以下属于“排出废物”这种生物特征的是[]A．牛羊吃草B．人体流汗C．鲸鱼喷水D．种子萌芽-七年级生物
• 下列各种生物活动中，属于动物特有的是[]A．利用水和二氧化碳合成自身所需要的某些有机物B．通过消化分解食物中的有机物，并将可利用的营养成分吸收C．将有机物分解成二氧化碳和-七年级生物
• 下列属于学习行为的是[]A．大山雀偷饮牛奶B．蜘蛛结网C．婴儿吮奶D．母鸡育雏-七年级生物
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