Bacteria that form biofilms secrete molecules that they use to communicate with each other. These locally-produced molecules allow the individual cells to sense each other, a phenomenon called quorum sensing and, in this manner, coordinate their behaviors to perform activities that are required for biofilm formation. To form a biofilm, the bacteria adhere to a surface and aggregate, forming spore-like structures. This makes them very resistant to antibiotic treatments. This phenomenon illustrates the ability of the cells to:

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.