Word: stomata
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Researchers are gleaning other secrets from plant leaves preserved in the middens. At the end of the last Ice Age, for example, plant structures called stomata, which are used to process carbon dioxide, were far denser than they , are today. This suggests that the ancient atmosphere contained much less carbon dioxide. Middens have even more to reveal. The well-preserved plant and animal DNA in midden specimens promises to be a bonanza for genetic researchers...
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