史前生物

Multi tool use
史前生物是指許多生活於地球上的生物體,年代範圍大約是從38億年前到大約公元前3500年人類開始保留文字紀錄以前。在這段演化期間,許多新型態的生命誕生;許多如恐龍般的生物則滅絕。
史前生物的型態包括了海洋中類似細菌的細胞生物,到藻類與原生生物,以及較為複雜的真核多細胞生物,如真菌、植物、軟體動物、昆蟲與脊椎動物等。以地質時代的尺度而言,人類出現的時間則相當晚近,早期人類大約形成於4百萬年前。
有少數的史前生物至今依然存在於地球上,例如腔棘魚一類被稱作活化石的生物。另外如鯊魚,也是經過數亿年而沒有太大改變的生物。不過大多數曾經出現的生物,有99%已經滅絕,只留下遺骸、腳印或其他化石。
參見
外部連結
- PREHISTORICS ILLUSTRATED .com
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