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3月24日，北京市少年宫，学生科技节优秀获奖作品展上，北京市育英学校的学生在展示校园环境智能导览系统。新京报记者 李木易 摄
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Close relatives of animals can become multicellular if distinct individuals join together or if dividing cells remain attached. A species has been found to use both mechanisms.
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