 Hey everybody, Dr. O here. Real quick video, we're going to talk about the three domains of life. So based on cellular organization, cellular structure, all life has been categorized as being in one of the three domains, and that is the bacteria, the archaea, which is how I say it, some of you will say it differently, and the eukaryea. So obviously most of the time you focus on the eukaryea, the eukaryotes, because that's where humans are as you can see from the yellow star there. But let's take a real quick walk through each of these. So obviously the bacteria are going to be focused on in microbiology so we won't go out through all the different types. The archaea, I call them prehistoric bacteria. They're bacteria that are, you know, they have some similarities to bacteria, but different cell walls, they're definitely not the same thing. We barely talk about them. And then we have the eukaryea, which to me, the eukaryotes, the ones we care about fall into four groups. You have the the animals, like us, you have the plants, you have the fungi, and you have the protists. So that's the one that's not on here. So just real quickly, a protist is basically it's this grouping of eukaryotes that are not plants, animal, or fungi. So from which everything else falls into the group protists. Now they do matter in microbiology, though, because algae and your protozoa, your single cell eukaryotic organisms, would be classified as protists. All right. So those are the three domains of life, bacteria, the archaea, and the eukaryea. So hope this helps. Have a wonderful day. Be blessed.