Bacteria, in the eyes of most people, are bad things, because it can make people sick with infection. So some people say, since it is a bad thing, why has it evolved from ancient times to the present and has not been extinct? In fact, our understanding of bacteria has entered a misunderstanding. Why?
Because we understand bacteria too simply, such as as a collection of one organism or several organisms, however, the fact is that the types of bacteria in nature can be said to be countless, for an intuitive comparison, we humans have only one, counting tigers, lions, elephants, cattle, sheep, pigs, mice and the like, adding up, the world is about 5,000 species of mammals. If you expand again, all the animals in the world, birds in the sky, earthworms on the ground, fish in the water, these animals add up, only more than 1 million species, and what about microorganisms? They have hundreds of billions or more. It can be said that this is an extremely large and terrifying world, and their distribution is naturally everywhere.
Then some people said, then since there are bacteria everywhere, and archaea are produced more than a billion years earlier than humans, why has it not evolved into a higher organism than humans? Let's talk about that today.
01, Why didn't archaea evolve into advanced organisms?
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In fact, quite the opposite. If archaea had the possibility of evolving into higher organisms, it would have been ruled out of archaea and become one of the armies in the field of eukaryotes.
We often ask questions like this, we evolved from monkeys, etc., but the answer to this question is no. We didn't evolve from monkeys, but rather, it's correct to say that we and monkeys came from the same ancestor and evolved separately.
02, Bacteria, archaea, and eukaryotes
Archaea have many unique characteristics of their own, and there are also many characteristics that are directly between bacteria and eukaryotic cells. I'll leave the nucleus alone.
I made a simple evolutionary diagram.

Bacteria, archaea, and eukaryotes are the three most basic types, all from a common ancestor, one of the most primitive single-celled organisms. Then they started evolving.
The first node: the formation of the nucleus is a point of differentiation of a core
If the nucleus of this organism is formed, then it is going to the advanced stage of eukaryotism, and if it does not form a nucleus, then it is a prokaryote.
What does the nucleus do? To use an inappropriate analogy, the cell is the dining room and the nucleus is the kitchen. Prokaryotic cells are characterized by simple barbecue stalls, kitchens and tables are placed together, so customers are susceptible to fumes; and eukaryotes have separate kitchens, so that no matter what the kitchen looks like, diners are relatively clean and tidy restaurants. That is to say, if one day, a prokaryotic cell suddenly decides to say that Lao Tzu is going to upgrade his equipment and build a restaurant, then he will jump out of the prokaryotic field and become a eukaryote, so his next achievements belong to our eukaryotes army.
The second node: the environment is the core.
Some creatures live in a rich environment, so in an instant, eat well and dress well, a lot of life, in the air, in the ocean, on the surface of the human body, in the intestines, anyway, there are traces of them everywhere. Some creatures, reincarnation is not good, living in the Shenma Crater, high salt zone, high acid and high alkali and other perverted places, that place, really, to live is victory, this group of ancient fungi, naturally it is impossible to evolve higher and higher creatures. In fact, for archaea whose sole purpose is survival, the single-cell form is more favorable for survival. At least you don't have to worry about the heart, liver and lungs, the kidneys, you are a single cell, eat yourself, the whole family is not hungry.
That is to say, if the archaea live in a better environment, then it will naturally accelerate its evolution, develop in the direction of eukaryotes, and then develop all the way to multicellular organisms until higher animals.
03, the difference between archaea and eubacteria (Encyclopedia)
1. Morphologically, archaea are cells with flat right-angle geometry that have never been seen in eubacteria. (Good hardship, round spherical is the best)
2. Metabolized in the middle, archaea have unique coenzymes. For example, methanogens contain F420, F430 and COM and B factors. (What is this all about eating)
3. On the presence or absence of introns, many archaea have introns.
4. In terms of membrane structure and composition, the archaeal membrane contains ethers rather than esters, wherein glycerol is connected to the long-chain hydrocarbon isoprene with ether bonds, rather than with ester bonds to fatty acids. (Not even esters, bilayers, incompatible wow)
5. In terms of respiration type, strict anaerobic is the main respiration type of archaea. (Cyanobacteria producing oxygen is one of life's greatest advances.)
6. In terms of metabolic diversity, archaea are simple and not as diverse as real bacteria. (Diversity is king)
7. In molecular plasticity, archaea have more variations than true bacteria.
8. At an evolutionary rate, archaea are slower than true bacteria and retain more primitive properties. (Slow evolution, good grievance)
04, Woese Theory
Here to add to the Willinge theory, which was proposed in 1977 after a broad comparison of the bacterial 16S rRNA base sequence, he believes that the development of the biological world is not a process from simple prokaryotes to more complete and complex eukaryotes, but the existence of three differently developed genetic systems, namely archaea, bacteria and eukaryotes. It is believed that these three genetic systems developed from each other almost simultaneously from a certain starting point, which is a primitive ancestor that is still unclear.
The diagram is as follows:
Think of an other question. We humans come from a common ancestor, an African woman (The African Origins Theory). Then, some people didn't evolve and became savage tribes, or returned to the ape tribe, that is, bacteria
Some people, unfortunately, live in Africa, and many years later, they still live a tribal life, that is, archaea. There are also people who are clever and clever, who go out of Africa and then form Asian and American people, who have entered the era of civilization and reached the peak of life, which is eukaryotes.