下图为青蛙的发育过程，请据图回答： (1)青蛙的个体发育的起点是 这道题怎么做：下图为青蛙的发育过程
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| (1)受精卵 水 变态发育 (2)尾→四肢 外鳃→内鳃→肺 (3)有尾 用鳃呼吸、心脏为——心房——心室 |
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