The Endoplasmic Reticulum (ER) is not a living organism. It is an organelle found within eukaryotic cells, meaning it's a part of a much larger, complex system. So, it doesn't "need to live" in the same way a creature does.

However, the ER does require certain conditions and components to function properly:

* The cell it resides in: The ER is completely dependent on the cell for its survival. It needs the cell to provide it with building blocks (proteins, lipids, etc.), energy (ATP), and a stable environment.

* Proteins: The ER requires specific proteins for its structure, function, and transport. These proteins are synthesized by ribosomes and transported to the ER.

* Lipids: The ER is a network of membranes, which are primarily composed of lipids. These lipids are synthesized within the ER itself.

* Calcium: The ER plays a crucial role in calcium regulation within the cell, and requires a constant supply of calcium ions.

* Energy (ATP): The ER needs energy to carry out its various functions, including protein folding, lipid synthesis, and calcium transport.

In essence, the ER is a vital part of the cell and requires the cell to provide it with the necessary components to function and perform its essential roles.