Biology

The correct answer is: A.It enables bacteria to sense their population density and adjust behavior.

Explanation:

Quorum sensing is a mechanism used by bacteria to monitor and respond to the density of their population. Bacteria release signaling molecules, often called autoinducers, into the environment. As the population grows, the concentration of these molecules increases. When a threshold concentration is reached, it triggers changes in gene expression that allow bacteria to coordinate behaviors that are more effective when performed collectively, such as biofilm formation, virulence factor production, or antibiotic resistance.

The other options are incorrect because:

B.It involves direct physical ...