下列动物中，属于体外受精的动物是（ ）A．鲫鱼B．青蛙C．海龟D．大 下列动物中，进行体外受精的是( ) A．鸡 B...
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自然界体外受精的生物包括鱼类与两栖类，体外受精是指精子与卵细胞在雌性生物体外结合产生受精卵的受精方式．这种受精形式一般在水中完成．精子可利用在水中运动的能力，游向卵细胞并与其结合．凡在雌、雄亲体交配时，精子从雄体传递到雌体的生殖道，逐渐抵达受精地点（如子宫或输卵管），在那里精子和卵细胞相遇而融合的，称体内受精，此方式大多发生在高等动物如爬行类、鸟类、哺乳类、某些软体动物、昆虫等．青蛙、大鲵属于两栖动物，鲫鱼属于鱼类，都是体外受精．海龟是爬行的动物，属于体内受精．故选：ABD
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绛旓細(1)灞炰簬浣撳鍙楃簿,浣撳鍙戣偛鐨勬槸 涓ゆ爾鍔ㄧ墿 澶氭暟纭楸 (2)灞炰簬浣撳唴鍙楃簿,浣撳鍙戣偛鐨勬槸 鐖绫汇侀笩绫 杞楸肩被 (3)灞炰簬浣撳唴鍙楃簿,浣撳唴鍙戣偛鐨勬槸 鍝轰钩鍔ㄧ墿
绛旓細閫夋嫨A 椴ら奔鏄鍗电敓鍔ㄧ墿
