Lifelong tooth - Issei Shisei
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The condition in which an animal's teeth grow once after birth and do not fall out again. Also, the classification of such animals. Rodents such as mice and squirrels fall into this category, and their teeth continue to grow throughout their lives. → Diphyodont → Polyphyodont Source: About Shogakukan Digital Daijisen Information | Legend |
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動物の歯が、出生後に1回生えるのみで、生えかわりが無いこと。また、そのような動物の分類。ネズミやリスなどのげっ歯類がこれにあたり、その歯は一生伸び続ける。→二生歯性 →多生歯性
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