卵生动物的受精卵孵化是在母体外进行的胚胎�育所需要的营养物质是由 提供的而 等胎生动物胎儿是通过 获得营养的. 题目和参考答案——青夏 Template




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tomski卵生动物的受精卵孵化是在母体外进行的胚胎�育所需要的营养物质是由 提供的而 等胎生动物胎儿是通过 coloring