As has been pointed out (repeatedly), bacteria are incredibly diverse. Saying they don't evolve is like saying humans and trees share a common ancestor, but didn't evolve either.
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I do get many answers. But none of them hits the point. Bacteria change, but they do not evolve. (biological evolution is MORE than just change. It turned monkey to human)
Well, why should we? Bacteria seem to survive very well indeed as monocellular organisms.I think my question is: why don't we see any multiple cell bacteria, after 4 billion years of evolution?
No. Evolution is change, nothing more. This may be the biggest hurdle for you to understand: an instance of evolution is a tiny change in the population. When accumulated over vast amounts of time, these tiny changes add up to something quite notable indeed.I do get many answers. But none of them hits the point. Bacteria change, but they do not evolve. (biological evolution is MORE than just change. It turned monkey to human)
As has been pointed out (repeatedly), bacteria are incredibly diverse. Saying they don't evolve is like saying humans and trees share a common ancestor, but didn't evolve either.
[serious];48638989 said:does the evolution of bacteria (well, bacteria like life) into eukaryotes and multicelluar organisms like plants and animals count?
If not, I'd also put forward quarum sensing (chemical "communication" between bacteria in order to cooperate with one another and synchronize actions such as the formation of biofilms. This could be the start of a new branch of multicellular life)
In the taxonomic sense, no, for the same reasons that we don't expect eukaryotes to evolve into something that isn't an eukaryote.Let's see it this way: Do we expect bacteria to evolve into something which is not bacteria any more?
Endosymbiosis, look into it. It's how eukaryotic cells came into being. And before you start saying it's impossible, It's been observed in the lab.As I pointed out repeatedly, bacteria do change. But no matter how diverse bacteria change, they are still defined by one definition of bacteria. To say that bacteria evolve is like saying human race is a consequence of evolution.
You are a dumbass.Until we see multiple cell bacteria, I insist that bacteria have not evolved a bit in the past billions of years.
Than why did plant cells and animal cells evolve? They did not either. There is no such thing called cell evolution.
That is my temporary conclusion.
But we do. Look at cyanobacteria:
And myxobacteria:
This is just two examples.
As I pointed out repeatedly, bacteria do change. But no matter how diverse bacteria change, they are still defined by one definition of bacteria.
To say that bacteria evolve is like saying human race is a consequence of evolution.
skin color is an adaptation to mitigating the protection against UV exposure and the skin's absorbtion for vitamin D synthesis.As I pointed out repeatedly, bacteria do change. But no matter how diverse bacteria change, they are still defined by one definition of bacteria. To say that bacteria evolve is like saying human race is a consequence of evolution.
bacteria are probably too simple to support a multicellular organism. animal, plant, fungal, and algal cells do a lot of work and have a lot of specialized machinery to help them achieve it efficiently.Until we see multiple cell bacteria, I insist that bacteria have not evolved a bit in the past billions of years.
Than why did plant cells and animal cells evolve? They did not either. There is no such thing called cell evolution.
That is my temporary conclusion.
Just as all animals and plants fall under the same category of eukaryotes. If you look at the tree of life website, perhaps it will give you a better understanding of the diversity inherent in eubacteria and archaea.As I pointed out repeatedly, bacteria do change. But no matter how diverse bacteria change, they are still defined by one definition of bacteria.
Human race (or better, clines) is a consequence of evolution.To say that bacteria evolve is like saying human race is a consequence of evolution.
1) You have been shown examples of multiple cell bacteriaUntil we see multiple cell bacteria, I insist that bacteria have not evolved a bit in the past billions of years.
What does this even mean in the context of the post you were responding to? Some guesses as to what may provide an answer:Than why did plant cells and animal cells evolve? They did not either. There is no such thing called cell evolution.
Which fails on several counts:That is my temporary conclusion.
You are a dumbass.
Yeah, I am dumb on this issue.
"So many days"..? Check the timestamps please. Paug posted #57 two hours after you posted #56.But it takes you smart people so many days to give me (a dumb) back a real challenge.
Given that you clearly didn't know that bacteria were already multi-cellular, you'll understand that we have to be extremely skeptical about a comment like "bacteria did minimum (or nothing) [evolving]" coming from you. If you were honest with yourself, you'd admit that you have no idea what bacteria have been doing in terms of evolution, and go out and do some learning before making such assertions.Even so, I have to say that the TIME is a critical factor. Over the time of earth history, plants and animals evolved a lot, but bacteria did minimum (or nothing).
Nobody has yet given me a good explanation on this fact.
Meet Anabaena. It even has different cell types, though it's far less sophisticated than a plant or an animal.I think my question is: why don't we see any multiple cell bacteria, after 4 billion years of evolution?
Then I don't see your point.I do get many answers. But none of them hits the point.
You know you are telling that to an evolutionary biology student?Bacteria change, but they do not evolve. (biological evolution is MORE than just change.
It did, but that doesn't mean smaller changes don't count as evolution. That's like saying crossing the continent is travelling but going to the next village isn't.It turned monkey to human)
But we do. Look at cyanobacteria:
Given that you clearly didn't know that bacteria were already multi-cellular, you'll understand that we have to be extremely skeptical about a comment like "bacteria did minimum (or nothing) [evolving]" coming from you. If you were honest with yourself, you'd admit that you have no idea what bacteria have been doing in terms of evolution, and go out and do some learning before making such assertions.
But we do. Look at cyanobacteria:
And myxobacteria:
This is just two examples.
You seem to be equating 'evolved' with 'became multicellular'. Why?I still say bacteria are not multicellular. I still say bacteria did not evolve in the past 4 billion years.
As we have shown you countless times, bacterial have evolved. We have observed them evolve specific, complex features in a matter of decades (the ability to metabolise nylon, the ability to ingest citric acid, etc).I am not ignorant, I am not convinced. And I think all you are simply defending the idea of evolution, not the particular issue of bacteria evolution.
Explain 'speciation', in terms of bacterial evolution.Do not distract the issue by nitpicking on the definition of evolution. It is not the point. If you want one, here is mine: no speciation, no evolution.
You seem to be equating 'evolved' with 'became multicellular'. Why?
As we have shown you countless times, bacterial have evolved. We have observed them evolve specific, complex features in a matter of decades (the ability to metabolise nylon, the ability to ingest citric acid, etc).
Your strawmen are showing, juvenissun...
This one is not that hard to shoot down:
Patently false.It is a colony of the same bacteria. They are NOT multicellular bacteria. Many other such examples can be easily found.
Laurence Moran said:Look carefully at the Anabaena filament. Do you see the fat round cell in the middle of the filament? That's a heterocyst. It's a differentiated cell that has become specialized for nitrogen fixation. All the other cells are capable of photosynthesis but the heterocyst specializes in fixing nitrogen. This species is a bacterial example of a multicellular organism with two types of cells.
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