TOEFL Reading: ETS-TOEFL阅读机经 - 6RBILU3M2176BGL5L$

Which of the following statements about bioluminescent creatures is implied by paragraph 2? A. Bioluminescent creatures cannot produce light if bacteria enter their light organs. B. Not all bioluminescent creatures have both photophores and chromatophores. C. Most bioluminescent organisms do not need the enzyme luciferase in order to produce light. D. Creatures with light-producing organs are much more common than those that have only light producing cells.