If structures where proteins are made are located on rough endoplasmic reticulum, then where are the structures where proteins are made located on?

Answer choices:
- epidermis and dermis
 - Something that makes plants green
 - The area was once underwater
 - Veins and arteries.
 - rough endoplasmic reticulum
 - sub-units of species
 - Earth orbiting the Sun
 - the body's largest organ

 

     rough endoplasmic reticulum     