Final answer:
To revive the growth of bacteria in part B without changing the medium, one can alter the physical environment, such as temperature, pH, and gas concentrations, to create conditions that favor bacterial reproduction.
Step-by-step explanation:
To get the bacteria in part B growing again without changing the medium, one could introduce a variety of changes to the physical environment. Since growing bacteria in culture requires careful control of environmental conditions, adjusting factors like temperature, pH, and atmospheric gas concentrations could restart bacterial growth. For instance, if the bacteria in question thrive at a certain temperature, ensuring the culture is incubated at this optimal temperature may encourage the remaining bacteria to reproduce. This premise is based on the understanding that maintaining an appropriate physical environment is crucial for bacterial growth, as stated in the reference provided. Adjusting these conditions can create an environment that allows for existing bacteria, possibly those that have formed endospores, to reactivate and start growing again.