如果地球沒了樹 - 地球科學討論
By Rachel
at 2007-10-22T13:50
at 2007-10-22T13:50
Table of Contents
如果地球變成水星球
那麼沒有樹木行光合作用
是不是動物就沒有氧氣可以呼吸了呢
沒了氧氣還會有什麼變化發生
謝謝
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Tags:
地球科學
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By Joseph
at 2007-10-24T22:18
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at 2007-10-27T06:45
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at 2007-10-29T15:12
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at 2007-10-31T23:40
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