A scientist found that a Petri dish from an experiment had not been cleaned several days earlier. In the dish, she discovered a bacterial culture that she had not seen during the experiment. How could she gather evidence to support a claim about whether the bacteria had developed from the material left from the earlier experiment? A. Take a sample of the bacteria and grow it in an incubator. B. Gather dirty Petri dishes from other labs to see if they grow the same bacteria. C. Check all the clean Petri dishes for residue from the previous experiment. D. Try the original experiment again, do not clean some of the Petri dishes, and see if the bacteria grow.