在生物界没有不行, 只有没必要.
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送交者: silxirt 于 2015-04-06, 12:13:00:
回答: 细胞壁和叶绿体有correlation吗? 由 pgss 于 2015-04-05, 22:52:26:
Exoskeleton in crustacean seems to be an impossible adaptation, because it prevents insects from growing up, then comes the solution of moulting and metamorphosis.
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