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Spiders obtain their oxygen through four respiratory organs located on the underside of their abdomens. These organs are arranged into two pairs, an anterior pair at the very front end of the abdomen, and a posterior pair behind the anterior pair.
Confidence votes 3.8K. Oxygen in, Carbon Dioxide out. Another answer. Breathing breathes in the atmosphere: not the whole atmosphere obviously, but its composition. Breathing in occurs because of the necessity of oxygen-entrance and breathing out occurs because of the necessity of carbon dioxide-exit.