List three sources of error with aseptic transfer technique that could explain why the nutrient broth showed growth of microbes.
a) Improper sterilization of equipment, contamination from the environment, inadequate incubation temperature.
b) Contamination from the environment, incorrect pH of the nutrient broth, improper handling of the Petri dish.
c) Improper sterilization of equipment, contamination from the environment, improper flame sterilization technique.
d) Inadequate incubation temperature, incorrect pH of the nutrient broth, improper handling of the Petri dish.
