Why isn't the mitochondrion classified as part of the endomembrane system?

Why isn't the mitochondrion classified as part of the endomembrane system? 






A) It is a static structure.
B) Its structure is not derived from the ER or Golgi.
C) It has too many vesicles.
D) It is not involved in protein synthesis.
E) It is not attached to the outer nuclear envelope.







Answer: B


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