of the tracheoles contain fluid. it is where the fluid and gas meet (= the fluid/gas interface), that exchange of gases occurs (oxygen is taken up, carbon dioxide is given off). as activity increases, the fluid is removed from the tracheoles. this means that the exchange of gases occurs nearer the cells...
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large-scale changes in behavior wil happen faster than we've ever seen in human history. solar power will gain efficiency and drop in cost at a rate that mimics the progress in smartphones over the last decade. while it'll still be an expensive and resource-intensive effort to create all these solar cells...
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