(2014·盐城北积源前讲全审杂通属呀三模)北美洲某种来自臭虫以当地无患子科植物的气球状蔓生果为食,臭虫需要用锋利的喙刺穿果实...
答案D解析:解析生物与生物之间相互选择杂但具集配个,共同进化,A正确;平底金苏雨树与当地植物争夺光照、水分、无机盐等,存在竞争关系,B正确;臭虫体内控制喙长的基因发生突变可能早于...
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达尔文加拉帕拉岛美洲雀喙的研织装丰见拉息先室创为究
**:解析:(1)喙粗而尖-以种子为食喙呈凿状-以果实为食喙尖而长-以仙人掌为食喙尖而短-以昆虫为食(2360问答)自然选择(3)变异(4)分子进化学说、妈川生屋谁负综合进化学说
主要以捕食小动物为食的鸟类的喙的形状特点是( )
spanD解析:解:各种鸟类的喙与其食性是相适应的,以捕食小动物为食的鸟类的喙的形状特点是坚硬,末端尖锐向下钩曲,如猫头鹰等.可见D正确.故选:D
主要以捕食小动物为食的鸟类的喙的形状特点是( )
D解析:以捕食小动物为食的鸟类的喙的形状特点是坚硬,末端尖锐向下钩曲.
达尔文认为取食仙人掌的地雀的喙尖而长的原因是( )
spanB解析:解:生物在繁衍过程中,个体之间会在许多性状方面如大小、喙形、食性等方面产生变异,其中的许多变异是能够遗传的.地雀的喙产生了变异不是为了适应环境.生物具有过度繁殖的...
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达尔文环球航来自行到达加拉帕戈斯群岛的某一岛屿时,发现该岛屿仙人掌非常丰富,该岛上的地雀的喙大多360问答尖而长。...
C解析:试题按照达尔技唱啊左氧执米数唱月怀文的观点,地雀的个体之间喙不同即存在着变异,有的地雀的喙支提今玉尖而长,有的喙粗而短,喙尖而长的地雀容易取食仙人掌而生存下来,这是适者生...
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下图表示加拉帕戈斯群岛上某种地雀在*********年种群平均喙长的变化和该地区**(该种地雀的主要食物)平均硬度的变化...
B解析独临:喙长和喙短是同一物种的同一性状的不同表现坐毛一类型,是一对相对性状,故A正确。1976年中期~1977年,由于**平均硬度增加,选择了叶白四讲陆太成针附喙长性状,故B...
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在教“鸟”概念时,用麻雀、燕子说明“前肢为翼,无齿有喙”是鸟来自概念的本质持征,这是帮轻混最范别费茶掌适当地运用了_____
D。解析:正例:为支持命题而存功氧微我走三在的例子。命题的条件和结论兼具。麻雀、燕子均是鸟类,且它们的基本特征是前肢为翼,无齿有喙。所以证明了前肢为翼,无齿有喙的是鸟的基本特征。
光明**-雷再声喙恶兽利亚多尔打法流程解析
光明**全新40人团本灰烬要塞开启,强大的雷喙恶兽boss现身,雷喙恶兽有些什么技能?激并限范里不了解的小伙伴别着急,今天小编就为各位玩家带来光明**雷喙恶兽利亚多尔打法攻...
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唐代诗人孟浩然的《春晓》中有著名诗句“春眠不觉晓,处处闻啼鸟.”诗中的鸟具有的特征是( )
C解析:鸟类的主要特征是:有喙沉无齿,身体被覆羽毛,前肢特360问答化为翼,长骨中空,心脏四腔,用肺呼吸,有气囊辅助呼吸,体温恒定,卵生等.
它有尾巴断列两须给跑,能飞。身上的羽毛五颜六色,它会吹口哨也能说话。它是什么呢?
鹦鹉。解析:它以其美来自丽无比的羽毛和擅长学人说话而闻名。它有坚硬的鸟喙,可以吃硬壳的坚果。
【题文】(1来自6分)仙人掌花看见别人家阳台上花草缤纷,煞是艳羡,激起了我养花的兴致。我从花草市场陆续买了一些回家种养,海棠、月季、杜鹃、米兰、文竹……开始还能记着浇水、松土、施肥,但终究是很难坚持,结果一盆盆花草都枝枯叶落。我这才**到红冲,养花并非只是闲情逸致,那完全是精明勤快人的事儿,与我这个愚汉、懒
试题答案:【答案】电修抓毫在功测【小题1】花瓣的所异厚措基短烟由又外换颜色、光泽(2分);花穗交冲、花粉的质感(2分)希剧川道料措标。【小题2】①丑皇陋的仙人掌竟开出了一朵异常漂...
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(16分)仙人掌花看见别人家阳台上花草缤纷,煞是艳羡,激起了我养花的来自兴致。我从花草市场陆续买了一些回家种养,海棠、月季、杜鹃、米兰、文竹……开始还能记着浇水、松土、施肥,但终究是很难坚持,结果一盆盆花草都枝枯叶落。我这才**到,养花并非只是闲情逸致,那完全是精明勤快人的事儿,与我这个愚汉、懒汉无缘。
试题答案:小题1:花瓣的颜色、光泽(2分);花穗报最圆低粮英兵不静、花粉的质感(2分)。小题2:①丑陋的仙人掌竟开出了一朵异常漂亮的金色花。(贵线细守面呼州春拿兰全2分)②为了抗...
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