Final answer:
The type of atmosphere required for strict anaerobic growth is one with no oxygen (No O₂), which is necessary for the survival and growth of obligate anaerobes.
Step-by-step explanation:
Strict anaerobes require an environment with no oxygen (O₂) for growth. Since obligate anaerobes are killed by the presence of oxygen, they must be cultured in conditions with an absence of free oxygen. According to the given information, the type of atmosphere required for strict anaerobic growth is an environment where no O₂ is present. This matches with B. No O₂ in the multiple-choice options provided. When discussing the oxygen requirements of bacteria, obligate anaerobes grow only in the absence of free oxygen, whereas facultative anaerobes like E. coli can grow with or without oxygen, and microaerophiles require a specific low level of oxygen.