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Hypoxia (environmental)
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<p>Hypoxia (<i>hypo</i>: 'below', <i>oxia</i>: 'oxygenated') refers to low <a href="/facts/Oxygen/acyn6o8r">oxygen</a> conditions. Hypoxia is problematic for <a href="/facts/Aerobic_organism/a629EQD7">air-breathing</a> organisms, yet it is essential for many <a href="/facts/Anaerobic_organism/bhQnlqCq">anaerobic</a> organisms. Hypoxia applies to many situations, but usually refers to the atmosphere and natural waters. </p>