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বহু প্রাচীনকালের উদ্ভিদ এবং প্রাণীর মৃতদেহের যে ধ্বংসাবশেষ মাটির নিচে পাওয়া যায় তাকে জীবাশ্ম বলে।
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বহু প্রাচীনকালের উদ্ভিদ এবং প্রাণীর মৃতদেহের যে ধ্বংসাবশেষ মাটির নিচে পাওয়া যায় তাকে জীবাশ্ম বলে।