Aloha, Biology Buddies! Today we're diving into the intriguing world of organism classification!🐾

In the old days, we had two main categories for all life forms, based on cell types: eukaryotes and prokaryotes. Eukaryotes have a nucleus and other complex structures in their cells, while prokaryotes are more simple, without a nucleus.

👾 Plot twist: as we studied the tiny RNA molecules in the ribosome (which we call rRNA), we realized that the prokaryote group was a bit of a wild party! So many diverse attendees - like a Comic-Con, but for cells! It turned out there were two distinct groups of prokaryotes: Eubacteria and Archaea.

So now, we have the "Three Domain System" which includes Eubacteria, Archaea, and Eukaryota. These are called domains. You might hear folks refer to the members of these domains as bacteria, archaeans, and eukaryotes.

Think of it like a cosmic classification carnival, with three main tents! 🎪

Bacteria and eukaryotes are the celebrities of the biology world, everybody knows them! But archaeans are often the unsung heroes, less familiar to most people. Imagine them as the indie artists of the microbial world. These are ancient life forms that often live in extreme environments, like the boiling pools of Yellowstone National Park!