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a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the interchange of gases between the interior tissue and the surrounding air.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
organelles in which cellular respiration takes place to produce ATP to supply cells with energy...