My father has not any brothers,my mother has not any brothers.eigher buti have many uncles.Who am I

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My father has not any brothers,my mother has not any brothers.eigher buti have many uncles.Who am I

雌雄同体动物:蚯蚓、蜗牛、水母、血吸虫和乌贼等

buti是什么东西?