Final answer:
The endomembrane system is a group of membrane-bound organelles in eukaryotic cells that work together to modify, package, and transport lipids and proteins.
Step-by-step explanation:
The endomembrane system is a group of membrane-bound organelles in eukaryotic cells that work together to modify, package, and transport lipids and proteins. It includes organelles such as the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, and vesicles. The plasma membrane is also considered part of the endomembrane system as it interacts with these organelles.