複選題

18. Refer to the simplified diagram of the nitrogen cycle shown in the figure. Which of the following statements are correct?
(A) 乙 is called denitrification.
(B) The roles that can represent producers in the diagram are 甲, 丁, and 戊.
(C) 甲 is called ammonification.
(D) 丁 is called nitrification.
(E) The role played by consumers in an ecosystem is the same as that of organism A in the diagram.

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