34．鸟类的繁殖大多在春天进行的具有时间为一年的性�期下图为此鸟体内一个性�期的激素调节过程请据图回答下列问题 �鸟类的繁殖是一种先天 Sketch Coloring Page

34．鸟类的繁殖大多在春天进行的具有时间为一年的性�期下图为此鸟体内一个性�期的激素调节过程请据图回答下列问题 �鸟类的繁殖是一种先天 Template

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