What is the main function of the Endoplasm Reticulum? I will reword whatever you wright just in case.

In biology, the endoplasmic reticulum (ER) is a continuous membrane system that forms a series of flattened sacs within the eukaryotic cell, cytoplasm and serves multiple functions, especially in protein synthesis, folding, modification and transporting proteins. An endoplasmic reticulum (ER) retains all eukaryotic cells.

Explanation:

2%? i tried finding the exact sorry if it's not 100% correct ; -;