Which term describes bacteria that thrive in environments with reduced oxygen levels?

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Multiple Choice

Which term describes bacteria that thrive in environments with reduced oxygen levels?

Explanation:
Organisms that grow best with less oxygen than is present in the air are microaerophiles. They require a reduced oxygen level—usually around 5% O2, sometimes up to 10%—to thrive, rather than the about 21% O2 found in ambient air. This distinguishes them from aerobes, which need normal atmospheric oxygen, and from obligate anaerobes, which are harmed by oxygen and grow best in its absence. Capnophiles, on the other hand, prefer higher CO2 levels, which is a separate requirement not defined by low oxygen alone. So the term that fits bacteria thriving in reduced oxygen environments is microaerophilic.

Organisms that grow best with less oxygen than is present in the air are microaerophiles. They require a reduced oxygen level—usually around 5% O2, sometimes up to 10%—to thrive, rather than the about 21% O2 found in ambient air. This distinguishes them from aerobes, which need normal atmospheric oxygen, and from obligate anaerobes, which are harmed by oxygen and grow best in its absence. Capnophiles, on the other hand, prefer higher CO2 levels, which is a separate requirement not defined by low oxygen alone. So the term that fits bacteria thriving in reduced oxygen environments is microaerophilic.

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