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

更多内容推荐

• 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
• 鼠兔是青藏高原上广泛分布的一种小型无尾的兔类，在许多人眼里认为它和家畜争夺草场，导致高山草地退化。因此，鼠兔一直被人类所毒杀。其实，鼠兔是青藏高原生态系统的关键性-八年级生物
• 下列哪一项不属于生物防治[]A．以农药治虫B．以虫治虫C．以鸟治虫D．以菌治虫-八年级生物
• 下图为家蚕发育过程示意图，请据图回答下列问题（1）A、B分别表示雄蛾和雌蛾，C表示______阶段，E表示_____阶段。像这样的发育过程称为发育。（2）养蚕是为了获得蚕丝，要使蚕丝-八年级生物
• 在自然界中，供给植物光合作用所需二氧化碳的过程有[]A．植物将自身合成的有机物分解B．动物将摄取的有机物分解C．微生物将动植物遗体分解D．以上三者都包括-八年级生物
• 我国的海洋鱼类资源非常丰富，为了充分利用海洋鱼类资源，应该多捕鱼。[]-八年级生物
• 下列各项是动物在自然界中的作用[]A．在维持生态平衡中起着重要的作用B．能促进生态系统中的物质循环C．能帮助植物传粉，传播种子D．以上都是-八年级生物
• 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
• 丸花蜂在取食花蜜时，也帮植物传了粉，这说明动物与植物关系是[]A．动物必须依靠植物生存B．丸花蜂是寄生虫C．动物和植物互为敌D．动物和植物相互适应、相互依存-八年级生物
• 动物在自然界中有哪些作用，请分别从生态平衡、物质循环和与其他生物的关系等方面说明，并各举一例。-八年级生物
• 下列生物中属于消费者的是[]A．草B．食虫鸟C．霉菌D．桃树-八年级生物
• 动物作为生态系统中的消费者，其与物质循环有关的主要功能是[]A．动物可以帮助植物传粉和传播种子B．动物在食物链和食物网中与植物相互依赖、相互制约C．进入动物体的食物将被分-八年级生物
• 蚯蚓是人类的好朋友，它不但可以疏松土壤，还可以：[]A．是常见的中药材B．处理垃圾C．增加土壤的肥性D．前三项都对-八年级生物
• 动物对于一个生态系统来说是很重要的，这是因为[]A．动物是食物的唯一来源B．动物能促进生态系统的物质循环C．动物能固定二氧化碳D．动物能释放氧气-八年级生物
• 大量捕杀农田中的青蛙会造成什么样的后果[]A．蛇类的食物断绝B．农田作物减产C．植食性昆虫减少D．农田温度升高-八年级生物
• ---What did our teacher do?---He raised his arm as a(n)for us to stop.A．signalB．adviceC．evidenceD．d
• (2014·福建省普通高中质量检查)Because of H7N9 bird flu，all the chicken markets in Shanghai have been closed and
• A new _______to teaching English is being used here, and it has proven to be very helpful to the stu
• Less than twenty percent of the employees in their company are women.That is to say，women are in the
• With no better way to express feelings of love and, it’s easy to see why everyone turns to the flow
• One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave p
• In order to prevent people spreading rumours through the Internet, the government decided to place _
• The police managed to gain through an upstairs window.A．approachB．wayC．accessD．passage-高三英语
• The villagers in the mountain have a firm ______ that they will have a good harvest next year.A．opi
• The system has been designed to give students quick and easy_______ to the digital resources of the
• The government is aiming to reduce the unemployment, but it’s quite _______ to have a job at all the
• I listened to Dr．Wilson's lecture about the protection of wild animals, but I was unable to gra
• The ___of North Korea and South Korea is getting worse and worse these days.A．positionB．situationC．
• Used to TV show, where everything is quick and entertaining, many people do not have the _______ to
• Nowadays more and more people regard traveling as part of their life, and Chinese transport has been
• In a way it was a(n)______ to know exactly what we were up against.A．effectB．meansC．reliefD．suggesti
• My first______ of him was that he enjoyed telling jokes.A．expressionB．attentionC．satisfactionD．impre
• We are good friends though he is ten years ________ to me.A．olderB．elderC．seniorD．more senior-高二英语
• My neighbor is very kind. I’ll never forget the ______ she’s done for me.A．actionsB．favorsC．deedsD．h
• All people around him like him, for he has a strongof humor.A．senseB．ideaC．feelingD．thought-高三英语
• My neighbor is very kind. I’ll never forget the ______ she’s done for me.A．actionsB．favorsC．deedsD．H
• When we learn English, a large _____ is needed.A．spellingB．vocabularyC．practiceD．memory-高一英语
• Mary is a good girl, but she has some___________. For example, she doesn’t like helping others.A．que
• Tom’s __towards guests really makes me feel embarrassed in the party. A．advantageB．abilityC．activity
• The medicine has a strong side ________ on our health though it works well.A．influenceB．effectC．affe
• The girl who is studying at the art college has a ______ for music and dance. A gift B present C pow
• All the apartments have been sold out while the building is still _____.A．ConstructedB．constructing
• Finding information in today’s world is easy．The is how you can tell if the information you get is u
• Considering the injuries he’s had there can be little of him winning the race.A．expectationB．satisfa
• According to news reports, personal _____of guns in the USA causes a lot of trouble. A．wealth B．poss
• Please give the ticket to ___ you think is the most suitable in my office.A．whoB．whomC．whoeverD．no m
• Teachers have to constantly update their knowledge in order to maintain their professional(专业的)_____