Naked Science Forum
Life Sciences => Plant Sciences, Zoology & Evolution => Topic started by: Petrochemicals on 20/09/2021 18:19:27
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Now the extinction at the kt boundary wiped the dinosaurs out pretty much, some survived in limited pockets apparently.
https://www.livescience.com/amp/7747-dinosaurs-survived-asteroid-impact.html
But why did they die out?
Dinosaurs where of all sizes and persuasions. If they where cold blooded why did the reptiles survive? If warm why where the mammals spared? Why would an entire clave of creatures perish and not any of the others?
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Some dinosaurs did survive, we call them birds.
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Some dinosaurs did survive, we call them birds.
That would require a rate of evolution in reaction to the kt event far exceeding viruses.
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That would require a rate of evolution in reaction to the kt event far exceeding viruses.
How do you figure?
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What killed the dinosaurs? Complacency.
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That would require a rate of evolution in reaction to the kt event far exceeding viruses.
You do realize that feathered flying dinosaurs and ground dwelling dinosaurs were contemporaries, don't you?
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That would require a rate of evolution in reaction to the kt event far exceeding viruses.
You do realize that feathered flying dinosaurs and ground dwelling dinosaurs were contemporaries, don't you?
That would require a rate of evolution in reaction to the kt event far exceeding viruses.
How do you figure?
Sponaneos evolution in the event of a comet strike is quite a trait. As the dinosaurs dissapeared entirely it would mean that all Dinosaurs instantaneously transformed into birds. Many types of animals survived. I have read that only omnivores survived, but this does not fit with crocodilians.
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Sponaneos evolution in the event of a comet strike is quite a trait.
That didn't happen.
As the dinosaurs dissapeared entirely it would mean that all Dinosaurs instantaneously transformed into birds.
No it doesn't. Birds already existed before the asteroid struck.
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Sponaneos evolution in the event of a comet strike is quite a trait.
That didn't happen.
that's the point.
As the dinosaurs dissapeared entirely it would mean that all Dinosaurs instantaneously transformed into birds.
No it doesn't. Birds already existed before the asteroid struck.
So did dinosaurs, but they all became extinct.
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that's the point.
Nobody ever claimed otherwise, so I'm not sure why you brought it up.
So did dinosaurs, but they all became extinct.
Not the birds.
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that's the point.
Nobody ever claimed otherwise, so I'm not sure why you brought it up.
in reply please see reply #6 by petrochemicals
So did dinosaurs, but they all became extinct.
Not the birds.
Birds where not the dinosaurs. For all the dinosaurs to evolve to birds once the asteroid hit would require a rate of evolution faster than those of viruses.please see quote below, That would require a rate of evolution in reaction to the kt event far exceeding viruses.
You do realize that feathered flying dinosaurs and ground dwelling dinosaurs were contemporaries, don't you?
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For all the dinosaurs to evolve to birds once the asteroid hit would require a rate of evolution faster than those of viruses.please see quote below
Why do you keep saying that? Did you not read or not understand my response?
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For all the dinosaurs to evolve to birds once the asteroid hit would require a rate of evolution faster than those of viruses.please see quote below
Why do you keep saying that? Did you not read or not understand my response?
Given that birds are reptiles, I find your lack of understanding mystifying.
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For all the dinosaurs to evolve to birds once the asteroid hit would require a rate of evolution faster than those of viruses.
They didn't: they evolved into birds before the asteroid hit. Well, at least one branch of them did. All of the others went extinct.
I find your lack of understanding mystifying.
As I find your lack of understanding that no one in here is proposing that the asteroid impact prompted anything to evolve into birds.
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Given that birds are reptiles, I find your lack of understanding mystifying
Birds are reptiles(?), that's absurd! Well that explains a lot, you have no idea what you are talking about.
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Birds are reptiles(?), that's absurd!
He's technically correct. In evolutionary biology, a clade can be defined as a subset of the clade it evolved from. Birds evolved from dinosaurs, which in turn evolved from reptiles. So birds are both dinosaurs and reptiles. Yes, you can even take it to the extreme and say they are fish, too.
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TNS podcast had an interview with dinosaur researchers working in northern Alaska. They believe from fossils of baby dino teeth that the larger dinosaurs like the duck-billed variety overwintered there (despite 3 months of no direct sunshine) - perhaps protected by a layer of feathers and/or hibernation.
Migratory birds that were around at the time could have flown south for the winter, and returned when the sun came up.
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Given that birds are reptiles, I find your lack of understanding mystifying
Birds are reptiles(?), that's absurd! Well that explains a lot, you have no idea what you are talking about.
Birds are reptiles(?), that's absurd!
He's technically correct. In evolutionary biology, a clade can be defined as a subset of the clade it evolved from. Birds evolved from dinosaurs, which in turn evolved from reptiles. So birds are both dinosaurs and reptiles. Yes, you can even take it to the extreme and say they are fish, too.
Aha, I've got you now!
Anywhooo!
You have
Dinosaurs can therefore be divided into avian dinosaurs, or birds; and the extinct non-avian dinosaurs
So thats
avian dinosaurs, or birds
And
extinct non-avian dinosaurs.
So the dinosaurs got killed and did not instantaneously evolve into birds. Anyway, I'm off in my non flying car, or my car as I call it.
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TNS podcast had an interview with dinosaur researchers working in northern Alaska. They believe from fossils of baby dino teeth that the larger dinosaurs like the duck-billed variety overwintered there (despite 3 months of no direct sunshine) - perhaps protected by a layer of feathers and/or hibernation.
Migratory birds that were around at the time could have flown south for the winter, and returned when the sun came up.
That is a further quandary. Dinosaurs appear better suited to survive the colder conditions. No creature above 25kg passed the kt boundary though.
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So the dinosaurs got killed and did not instantaneously evolve into birds.
There isn't a soul in this thread who so much as implied that such a ridiculous thing occured.
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So the dinosaurs got killed and did not instantaneously evolve into birds.
There isn't a soul in this thread who so much as implied that such a ridiculous thing occured.
Please see read the reply #10 by petrochemicals, referencing reply #6 by petrochemicals.
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Please see read the reply #10 by petrochemicals, referencing reply #6 by petrochemicals.
That didn't help. Who is it that you are arguing against?
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Please see read the reply #10 by petrochemicals, referencing reply #6 by petrochemicals.
That didn't help. Who is it that you are arguing against?
Please see/read the reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
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Please see/read the reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
Yes, because referencing a reply that I already said was unhelpful is sensible response...
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Please see/read the reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
Yes, because referencing a reply that I already said was unhelpful is sensible response...
Well maybe but the likehood of the 45 percentile rejection in unknown boundary layers. ..............
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What is that supposed to mean?
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What is that supposed to mean?
Please see/read the title, the reply #22 by petrochemicals referencing reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
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Are you being hard to understand on purpose? This discussion would progress much more smoothly if you spoke plainly instead of referring me back to things that you've already said.
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Are you being hard to understand on purpose? This discussion would progress much more smoothly if you spoke plainly instead of referring me back to things that you've already said.
Please see/read the title, the reply #26 by petrochemicals referencing reply #22 by petrochemicals referencing reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
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The answer appears to be yes.
And verging on spam.
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Please see/read the title, the reply #26 by petrochemicals referencing reply #22 by petrochemicals referencing reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
Are you trying to be clever? If you are it ain't working...
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The answer appears to be yes.
And verging on spam.
Please see/read the title, the reply #28 by petrochemicals referencing the reply #26 by petrochemicals referencing reply #22 by petrochemicals referencing reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
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Please see/read the title, the reply #26 by petrochemicals referencing reply #22 by petrochemicals referencing reply #20 by petrochemicals referencing reply #10 by petrochemicals, referencing reply #6 by petrochemicals
Are you trying to be clever? If you are it ain't working...
Very constructive.
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In a (probably vain) attempt to break the cycle of spam by Petrochemicals, I'll answer the title by saying, "we don't know for sure, but the asteroid impact that happened 66 million years ago probably had a big influence on it". That being said, there was recently some good evidence found for the survival of non-avian dinosaurs for about half a million years after that impact. For some reason, I'm having trouble finding the article right now, though.
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In a (probably vain) attempt to break the cycle of spam by Petrochemicals, I'll answer the title by saying, "we don't know for sure, but the asteroid impact that happened 66 million years ago probably had a big influence on it". That being said, there was recently some good evidence found for the survival of non-avian dinosaurs for about half a million years after that impact. For some reason, I'm having trouble finding the article right now, though.
This is the op.
Now the extinction at the kt boundary wiped the dinosaurs out pretty much, some survived in limited pockets apparently.
https://www.livescience.com/amp/7747-dinosaurs-survived-asteroid-impact.html
But why did they die out?
Dinosaurs where of all sizes and persuasions. If they where cold blooded why did the reptiles survive? If warm why where the mammals spared? Why would an entire clave of creatures perish and not any of the others?
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This is the op.
Okay, I feel completely stupid that the very article I was referencing was right there in the first post all along...
...and so it seems that the news wasn't recent at all. That article is from 12 years ago.
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Why would an entire clave of creatures perish and not any of the others?
Large animals are far more exposed a little lizard can be covered by a large rock but a dinosaur is out in the open and will be consumed by the heat and shock wave of an impact. Plus smaller creatures can be preserved by means of floating debris after such an event. Warm ground and cover are vital for the protection of the smaller animals.