NURSING ANM AND GNM

Detailed explanation-1: -Obligate anaerobes, which live only in the absence of oxygen, do not possess the defenses that make aerobic life possible and therefore cannot survive in air.

Detailed explanation-2: -Strict anaerobes do not grow in 10% carbon dioxide in air; microaerophilic bacteria can grow in 10% carbon dioxide in air or under aerobic or anaerobic conditions, and facultative organisms can grow in the presence or absence of air. The physiologic basis for oxygen sensitivity is not well understood.

Detailed explanation-3: -Aerotolerant anaerobes don’t require oxygen, but can grow in its presence, while strict obligate anaerobes cannot use oxygen and cannot grow or survive in its presence. Microaerophiles use oxygen, but at lower concentrations than atmospheric oxygen levels (which is  20%).