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如何区分美国青蛙的雌雄啊?要从外部特征区别啊
如何区分美国青蛙的雌雄啊?要从外部特征区别啊
发布时间:2021-02-20 23:32:07
如何区分美国青蛙的雌雄啊?要从外部特征区别啊
网友回答
从外部特征区别说我不大清楚,但是我有一个窍门:拿在手中一握,有两气囊鼓出的是公的,相反没有气囊鼓出的是母的.
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卵与受精卵的区别,卵可以是卵细胞吗?青蛙的发育起点可以写成卵吗?
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