WHERE THE HECK DID ALL THOSE STRUCTURES INSIDE COMPLEX CELLS COME FROM?

Summary from the TLDR newsletter

Eukaryotic cells have membrane-bound nuclei and a system of internal membranes called the endoplasmic reticulum. There are several competing theories about how these structures developed. Scientists have only recently been able to start investigating the origin of these structures using new technologies. This article provides an overview of the theories around the structures and a roadmap of how scientists plan to uncover their beginnings.