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一个新的向日葵家族树揭示了花的对称性独立进化了多次。向日葵科的一种,具有或不具有双侧花对称性。菊花左上)和青蒿右上)是来自同一部落的亲缘关系密切的物种;前者有两侧对称的花射线),而后者没有。向日葵部落https://img.3dmgame.com/uploads/images/news/20190501/1556700143_518843.jpg|https://img.3dmgame.com/u...
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