下图是青蛙的�育过程图请根图回答下列问题1青蛙的精子和卵细胞在水水中结合形成受精卵这种受精方式叫体外受精体外受精.2蝌蚪象鱼的 Template




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tomski下图是青蛙的�育过程图请根图回答下列问题1青蛙的精子和卵细胞在水水中结合形成受精卵这种受精方式叫体外受精体外受精.2蝌蚪象鱼的 coloring