乌龟是两*动物吗?
乌龟不是两*动物。两*动物幼体生活在水*,用鳃呼吸。而乌龟自生下来就是用肺呼吸,而且是变温动物,所以它是爬行动物不是两*动物。乌龟是爬行动物在生命进化的过程*,爬行动物占有极其重...
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蛇颈龙长什么样
是海中爬行类的一种,来自海中爬行类包括了海洋鳄鱼和鱼龙以及沧龙。它们由陆上生物演化而来,再回到海洋中生活。这些中形的爬行类活在三叠纪到白垩纪晚期。它们必须生活在干净的水域中,主要...
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蛇颈龙有何特点来自?
蛇颈龙是海中爬虫类的一种,海中爬虫类包括了海洋鳄鱼和鱼龙。它们由陆上生物演化而来,再回到海洋中生活。这些中形的爬虫类活在三叠纪到白垩纪垂快真井停车印封威职末晚期。它们必须生活在乾...
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蛇颈龙有何特点?
蛇颈龙是海中爬虫类的一种,海中爬虫类包括了海洋鳄鱼和鱼龙。它们由陆上生物演化而来,再回到海洋中生活。这些中形的爬虫类活在三叠纪到白垩纪晚期。它们必须生活在乾净的水域中,主要以食来...
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最早的两栖动物是什么?
最早的两栖动物是出现于古生代泥盆纪晚期的鱼石螈和棘鱼石螈,它们拥有较多鱼类的特征,如尚保留有尾鳍,并且未能很好的适应陆地你安的生活。鱼石螈和棘鱼石螈代表鱼类和两栖动物之间的过渡类...
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海洋类动物有哪些
海洋类动物有:息条右盾式海鳗、海狮、刺鳐、海蛇、石鱼、箱形水母、虎鲨等。海洋动物是海洋中异养型生物的总称。门类繁多,各门类的形态结构和生理特点可以有很大差异。来自微小的有单细胞原...
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方舟起源里面可以选择哪些恐龙要哪些不要吗
这果犯妒歌身谈职个是最可能令恐龙灭绝的原因,但在白垩纪的沉积物中发现了丰富份量,使人猜想乃行星撞击所留下证据,后肢粗大有力,在水中穿梭自如。但是后来因为天气越来越干旱,水中的恐龙...
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鲸的祖先是什么动物?
答案鲸目的远系祖先先应1无机物-----------蛋白质等有机物---------原生动物----------------2公认的【棘皮动物】说,【棘皮动物中海参慢展跑同掌的幼...
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鲸的祖先是什么动物?
答案鲸目的远系祖先先应1无机物-----------蛋白质等有机物-----来自----原生动物-360问答-------------久规磁应既虽适一革政--2公认的【棘皮动物】...
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远古动物有哪些
三叶虫。生活习性:三叶虫与珊瑚、海百合、腕足动物、头足动物等动物共生。大多适应于浅海底栖爬行或以半游泳生活,还有一些在远洋中游泳或远洋中漂浮生活。生活习性的不同决定着其身体构造不...
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石炭纪有哪些生物?
在侏罗纪时代伪龙类和板齿龙类都绝种,但鱼龙存晶及小州境古够令英溶供活了下来,生活在浅海中的动物还有一群四肢己演化成鳍形肢的海鳄类和硬骨鱼类。其他的海洋生物还有蛇颈龙和短龙。到了晚...
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侏罗纪的主川掌要植物是什么?
在侏罗纪时代伪龙类和板齿龙类都绝种,但鱼龙存活了下来,生活在浅海中的动物还有一群四肢己演化成鳍形肢的海鳄类和硬骨鱼类。其他的海洋生物还有蛇颈龙和短龙。到了晚期,鱼龙和海鳄类逐渐步...
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侏罗纪时代都有哪些主要生物?
在侏罗纪时代伪龙类和板齿龙类都绝种,但鱼龙存活了下来,生活在浅历东海中的动物还有一群四肢己演化成鳍形肢的海鳄类和硬骨鱼类。其他的海洋生物还有蛇颈龙练转听待于半和短龙。到了晚期,鱼...
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