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EGGS WITH A SHELL ~320 million years
The eggshell is one of the most important developments of the Carboniferous. As it contains the water necessary for survival, it allowed the animals to live in greater distance to the water and settle on the land.
帶殼蛋 ~3億2千萬年前
蛋殼是石炭紀中最為重要的產物之一，它能護住生存所需的水分而不外漏，使得動物能夠生活在離水遠些的地區，然後在陸地上定居。
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