13- The Endoplasmic Reticulum (ER)

The smooth ER and rough ER are like a "mailroom" because their main job is to collect, maintain, and transport things. They are located in the cytoplasm of both plant and animal cells.

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My Example:

I believe the ERs are like a mailroom because they collect, maintain, and transport, like a mailroom collects mail, maintains it, and then transports it to the recipient.