Organisms in a Biofilm Differ from Planktonic Bacteria in That ________

Organisms in a biofilm differ from planktonic bacteria in that ________.

A) biofilms typically contain multiple species of bacteria living in a complex,whereas planktonic bacteria are single,free-floating organisms
B) organisms in a biofilm secrete quorum-sensing chemicals to monitor the population; planktonic bacteria do not produce these chemicals
C) an organism in a biofilm will activate different genes compared to a planktonic organism of the same genus and species
D) organisms in a biofilm secrete extracellular materials to keep them anchored to a surface; these substances are not produced by free-floating bacteria 
E) All of the choices reflect differences between biofilms and planktonic bacteria