Few mammal species can survive in less than a 10% oxygen atmosphere.

Name: Few mammal species can survive in less than a 10% oxygen atmosphere.
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Most mammals require oxygen levels of approximately 21% in the atmosphere to survive. Oxygen levels below 10% can be deadly for mammals due to the lack of oxygen needed for cellular respiration. However, there are a few mammal species that have adapted to live in low-oxygen environments, such as burrowing animals and some aquatic mammals.

Few Mammal Species Can Survive in Less Than a 10