下列动物的活动，除哪项外，其他在一定程度上都具有改良土壤的作用[]A．蚂蚁B．蚯蚓C．蝗虫D．蜣螂-八年级生物

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• 动物通过呼吸作用将体内的一部分有机物分解成无机物，这体现了动物在自然界中的哪项作用[]A．维持生态平衡B．促进生态系统中的物质循环C．帮助植物传D．帮助植物传播种子-八年级生物
• 春天鲜花盛开的时候，花丛中飞舞着蜜蜂等许多昆虫。你认为它们对花朵起的主要作用是[]A．修饰花朵B．防治害虫C．帮助传粉D．传播种子-八年级生物
• 植食动物在生物圈中充当什么角色[]A．分解者B．生产者C．消费者D．自养生物-八年级生物
• 苍耳果实的表面有许多钩刺，下面说法正确的是[]A．可以钩挂在动物的毛皮上，有利于它的繁殖和分布B．是一种自我保护，防止动物取食，有利于生存C．是一种特殊的表现而已，没有实-八年级生物
• 白蚁的消化道内生活着一种叫鞭毛虫的单细胞生物，它能把白蚁所食的木纤维分解成营养成分，供白蚁吸收，同时白蚁为鞭毛虫的生活提供有机物。白蚁和鞭毛虫的关系是[]A．腐生B．竞-八年级生物
• 用细菌和真菌作为生物杀虫剂治虫，可减少农药的用量，减轻对环境的污染，这种方法也属于生物防治。下列不属于生物防治的是[]A．苏云金杆菌杀棉铃虫B．用粘蝇纸毒杀苍蝇C．白僵菌-八年级生物
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• 如图所示，在一个叫大的玻璃缸中，下层装入颜色较深的黏土，第二层装入颜色较浅的的沙土，上层装入颜色较深的黏土。每层都稍加按压，玻璃缸中的土要保持一定的湿度。选几条生-八年级生物
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