两栖动物的幼体要经过____才能上陆生活。-八年级生物

更多内容推荐

• “稻花香里说丰年，听取蛙声一片”，发出鸣叫的蛙的性别及鸣叫的意义是[]A．雄蛙、求偶B．雌蛙、求偶C．雄蛙、报警D．雌蛙、报警-八年级生物
• 下面具有变态发育的动物是[]A．蛇B．青蛙C．家兔D．家鸽-八年级生物
• 请用连线把下面的生物归入它们所属的生物类群中，并把生物类群与它们的特征相连：白鳍豚病毒无细胞结构链球菌细菌变态发育艾滋病病毒哺乳动物胎生哺乳海马两栖动物无成形的细-八年级生物
• 具有变态发育的一组动物是①蝗虫②鲫鱼③蜜蜂④青蛙[]A．①②B．①②③C．①③④D．②③④-八年级生物
• 从蝌蚪发育到青蛙，呼吸器官的变化是[]A．鳔、鳃、肺B．外鳃、肺C．内鳃、肺D．外鳃、内鳃、肺-八年级生物
• 常见的两栖动物有、、等。-八年级生物
• 两栖类动物的生殖与发育过程（1）两栖类概念：幼体在水中生活，用腮呼吸；成体在潮湿陆地上生活，有时下水，用肺呼吸，皮肤辅助呼吸。（2）蛙的发育经历_______________________四-八年级
• 下图为青蛙的发育过程，请据图回答：(1)青蛙的个体发育起点是[]________。从整个发育过程来看，青蛙的发育属于________。(2)从图中可以看出[]最像鱼，从外形上看像鱼的特点是-八年级生物
• 鱼类受精卵的孵化受水温影响很显著，下列表格和曲线图是某种鱼的受精卵在不同水温中孵化的实验结果：水温（℃）1418222630343842平均孵化率（%）0557092845660请根据图表数据分析回-
• “黄梅时节家家雨，青草池塘处处蛙。”春末夏初，青蛙的叫声此起彼伏。如果寻声找去，你会发现池塘中的青蛙正在抱对；不久后再来，会在水中看到小蝌蚪；如果继续观察下去，会看-八年级生物
• 下面是青蛙变态发育的过程，请将其按正确的顺序排列①尾和鳃逐渐消失，形成肺②同鱼的形态十分相似③长出前肢④长出后肢⑤有尾，也有后肢[]A．①③②④⑤B．④③⑤①②C．②③④⑤①D．②④③⑤①-八年级生物
• 个体发育属于变态发育的是[]A．大鲵B．鲫鱼C．蜥蜴D．蛇-八年级生物
• 蝌蚪用________呼吸，青蛙用________呼吸。-八年级生物
• 下列关于动物生殖和发育方式的描述中，错误的是[]选项生物种类受精方式发育方式A金鱼体外受精体外发育B青蛙体外受精体外发育C家鸡体内受精体外发育D蝴蝶体外受精体外发育-八年级生物
• 两栖动物的幼体一般都生活在______中，成体营________生活。-八年级生物
• ________ the delayed flight will take off depends much on the weather.A．WhyB．WhenC．ThatD．What-英语
• I will carry out the plan _____ there is much difficulty ahead.A．as ifB．even ifC．ifD．unless-高一英语
• 两栖类的代表动物青蛙，其生殖和发育过程包括如下几个阶段：①蛙的卵块；②雌雄蛙抱对；③蝌蚪；④成蛙；⑤雄蛙鸣叫。请指出正确的排列顺序。[]A．⑤④②①③B．②⑤①③④C．⑤②①③④D．②①⑤③④-七年级
• 下列对两栖动物的描述，错误的是[]A．既能生活在水中，又能生活在陆地上的动物是两栖动物B．两栖动物变态发育，幼体为蝌蚪，成体具有四肢C．两栖动物幼体生活在水中，成体一般在-八年级生物
• 青蛙的生殖发育特点是[]A．雌雄同体、体内受精、体内发育B．雌雄同体、体外受精、体外发育C．雌雄异体、体内受精、体内发育D．雌雄异体、体外受精、体外发育-八年级生物
• “黄梅时节家家雨，青草池塘处处蛙。”春末夏处，青蛙“呱、呱、呱”的叫声此起彼伏。如果寻声找去，你会发现池塘中的青蛙正在抱对。不久，如果你再来，会在水中看到小蝌蚪。如果-八年级生物
• 青蛙的变态发育大约经历多少天[]A．30多天B．40多天C．50多天D．60多天-八年级生物
• Please send us all the information _________ you have about the candidate for the position.A．thatB．w
• Half an hour later, Lucy still couldn’t get a taxi _______ the bus had dropped her. A．untilB．whenC．a
• The professor had no sooner finished his speech ________ the students started cheering.A．sinceB．whe
• -What are you going to do this afternoon?-I'll probably go for a walk later on＿＿＿it stays fine．
• （2014年北京市西城区高三5月二模试题）22. ______ Stephon Marbury is an American, he has become a role model among Bei
• 青蛙的生殖方式是[]A．卵生、体内受精B．卵生、体外受精C．胎生、体外受精D．胎生、体内受精-八年级生物
• 每年春末夏初，池塘边传来阵阵蛙鸣，这是雄蛙在[]A．唱歌B．求偶C．捕食D．呼吸-八年级生物
• Cathy had quit her job when her son was born _______ she could stay home and raise her family.A．now
• “Every time you eat a sweet, drink green tea.” This is _____ my mother used to tell me.A．whatB．howC．
• Was it on a lonely island ________ he was saved one month after the boat went down？(2011·四川)A．where
• our manage objects to Tom’s joining the club, we shall accept him as a member. A．UntilB．UnlessC．IfD．
• 下列受精方式属于体外受精的生物是（）A．青蛙B．蟾蜍C．家蚕D．鸡-八年级生物
• I toured the Great Wall，I was deeply impressed with the beautiful scenery．A．For the first timeB．At
• It’s uncertain ____ the fashion show will be held next week.A．whatB．whyC．whetherD．that-高一英语
• ________ parents say and do has a lifelong effect on their children.A．ThatB．WhichC．WhatD．As-英语
• I think _______ impresses me about his painting is the colours he uses.A．whatB．thatC．whichD．who-英语
• （2014年安徽省合肥市高三第三次教学质量检测）28. Let's take a bus or taxi to the park — ______ you'd prefer to
• Choosing the right dictionary depends on ________ you want to use it for.A．whatB．whyC．howD．whether-英
• _______ you start eating in a healthier way, weight control will become much easier.A．UnlessB．Althou
• ________ (assume) that we can't get the necessary equipment, we will have to give up the experi
• The news _____ the spaceship succeeded in returning to the earth spread everywhere.A．thatB．whichC．wh
• Having checked the doors were closed, and ________ all the lights were off, the boy opened the door
• The patient's son asked the doctor the question ________ his father could survive the big opera
• The boss refused to sell the car for ________ he thought was not satisfactory.-高三英语
• —The patient looks much better. ________ is it that has made him ________ he is today?—I think it is
• ---Could you please give the dictionary to Wang Feng?---Yes, of course! I’ll give it to him _______
• Give me a chance, ________ I’ll give you a wonderful surprise.A．ifB．orC．andD．while-英语
• ________ I really don't like art, I find his work impressive.-高三英语