送交者: Enlighten 于 2005-11-21, 15:07:27:

回答: there are also annual ones. so you can hear that every year. 由 无知 于 2005-11-21, 15:02:36:

For example, if all women have their periods in exactly 30 days, you would still have women in period everyday.

But the majority of cicadas in U.S. seem to have this period the same year. That's why I asked if they all came to this continent in the same year.

• It's a population survival strategy. - Latino2 (74 bytes) 2005-11-21, 15:11:35
  • But why in China there's no such a surge of cicadas? - Enlighten (183 bytes) 2005-11-21, 15:16:12
    • 神奇的生命质数现象——美国17年蝉揭密 (ZT) - Latino2 (1938 bytes) 2005-11-21, 15:21:32
      • 还有Qinren的《本草备要》说…… - wasguru (182 bytes) 2005-11-21, 15:51:55
        • 又昼鸣夜息，故止小儿夜啼…… - wasguru (38 bytes) 2005-11-21, 15:58:33
        • 法姑英明，亡秦文化害人不浅。 - 无知 (0 bytes) 2005-11-21, 15:55:48
      • 不准确。不是寂静十七年再度热闹。看我的连接。 - 无知 (82 bytes) 2005-11-21, 15:27:39
        • very cool. - Enlighten (0 bytes) 2005-11-21, 15:34:18
      • hehe, so it's qin-ren's fault... - Enlighten (0 bytes) 2005-11-21, 15:26:31
• man, you didn't follow the news, did you? there ain't 17 broods. - 无知 (0 bytes) 2005-11-21, 15:10:14

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