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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.
Introduction. In its elemental state, Oxygen is a colorless, odorless, diatomic gas with chemical formula O 2 and will often act as an oxidizing agent. Lewis structure of the. Oxygen gas molecule. Oxygen gas makes up about 20% of the Earth's atmosphere. Higher concentrations of Oxygen gas increase the risk of fire and the combustion of flammable substances. One should keep this in mind and take appropriate safety precautions when working in an Oxygen-rich atmosphere.