Henry read about a mass extinction that took place at the end of the Paleozoic era. Scientists have found evidence that many volcanic eruptions and their debris slowed (RESPIRATION OR PHOTOSYNTHESIS) and the amount of carbon dioxide in the oceans (INCREASED OR DECREASED) . Organisms could not adjust to these changes fast enough and a mass extinction followed.
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Henry read about a mass extinction that took place at the end of the Paleozoic era. Scientists have...
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