化石
化石faa3 sek6係好耐以前啲生物喺石頭留低嘅痕跡、印記，可以分為三類：
佢哋通常喺缺氧而平靜嘅環境形成，而多數喺沉積岩搵到。因為咁，佢哋可以提供岩石年齡、古代環境，以致生物演化嘅重要資訊同證據。
睇埋
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