Which of the following statements about biofilms is true?

Which of the following statements about biofilms is true?
 
  a. They are formed by prokaryotes living in a watery environment.
  b. They may develop on surgical implants.
  c. An example is dental plaque.
  d. They are formed by prokaryotes living in a watery environment and they may develop on
  surgical implants.
  e. They are formed by prokaryotes living in a watery environment, they may develop on
  surgical implants, and an example is dental plaque.

Question 2

____ are dormant structures formed by certain bacteria in response to unfavorable environmental
  conditions.
 
  a. Capsids
  b. Endospores
  c. Endotoxins
  d. Exotoxins
  e. Heterocysts