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The endoplasmic reticulum:

Afunctions in internal transport of macromolecules.
Bcarries on cellular respiration.
Cis the site of photosynthesis.
Dis dispersed nuclear material of dna and protein

Verified Answer :

Vimal

functions in internal transport of macromolecules.

The endoplasmic reticulum, I believe would function in transporting molecules and other substances, including macromolecules, thus is an internal transport system.