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Questions that don't need their own topics vol.2; New and fresh
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Topic Started: Jan 4 2018, 11:18 AM (26,854 Views)
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Russwallac
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May 29 2018, 05:32 PM
Post #646
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Not much point to it. A third eye wouldn't serve any real purpose in most tetrapods.
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"We've started a cult about a guy's liver, of course we're going to demand that you give us an incredibly scientific zombie apocalypse." -Nanotyranus
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HangingThief
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May 29 2018, 06:35 PM
Post #647
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- Cool_Hippo43
- May 20 2018, 05:15 PM
how and why mammals became viviparous? Why did the development of the fetus inside the mother replace the eggs? Could this happen to birds and reptiles, for example? Eggs are vulnerable. Viviparity protects the fetus and makes it practical to provide offspring with a much bigger head start than eggs typically would.
It has happened many times in reptiles among various groups of snakes and lizards. Some skinks even have a sort of placenta. There are also many fish, amphibians and countless invertebrates that give live birth to fully developed young.
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Hey.
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Velociraptor
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May 29 2018, 11:46 PM
Post #648
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Could an Earth-like planet have rings like Saturn?
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Unnamed No K-Pg project: coming whenever, maybe never. I got ideas tho.
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lamna
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May 30 2018, 02:01 AM
Post #649
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Yes and no.
Earth could have a ring like that, but it would decay rather quickly.
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Living Fossils
Fósseis Vibos: Reserva Natural
34 MYH, 4 tonne dinosaur.
- T.Neo
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Are nipples or genitals necessary, lamna? [flash=500,450] Video Magic! [/flash]
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LλmbdaExplosion
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May 30 2018, 02:25 AM
Post #650
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Vieja Argentea the oscar cichlid
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- HangingThief
- May 29 2018, 06:35 PM
- Cool_Hippo43
- May 20 2018, 05:15 PM
how and why mammals became viviparous? Why did the development of the fetus inside the mother replace the eggs? Could this happen to birds and reptiles, for example?
Eggs are vulnerable. Viviparity protects the fetus and makes it practical to provide offspring with a much bigger head start than eggs typically would. It has happened many times in reptiles among various groups of snakes and lizards. Some skinks even have a sort of placenta. There are also many fish, amphibians and countless invertebrates that give live birth to fully developed young. Eggs are actually much efficient.
But since mammals and few squamates give birth and it was successfull ,why not still keep this way of breeding since worked.
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When life give you lemons.............Don't make lemonade!Make life to take the lemons back!Get mad and than.........Yell,demand and burn down their homes.
Prepare for unforeseen consequences,Mr. Freeman!
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LλmbdaExplosion
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May 30 2018, 02:26 AM
Post #651
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Vieja Argentea the oscar cichlid
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- lamna
- May 30 2018, 02:01 AM
Yes and no.
Earth could have a ring like that, but it would decay rather quickly. That woulde be fun to see the rings fall and cause an extinction greater than KT.
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When life give you lemons.............Don't make lemonade!Make life to take the lemons back!Get mad and than.........Yell,demand and burn down their homes.
Prepare for unforeseen consequences,Mr. Freeman!
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CaledonianWarrior96
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May 30 2018, 04:50 AM
Post #652
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- LλmbdaExplosion
- May 30 2018, 02:26 AM
- lamna
- May 30 2018, 02:01 AM
Yes and no.
Earth could have a ring like that, but it would decay rather quickly.
That woulde be fun to see the rings fall and cause an extinction greater than KT. Well no, not really. As much as we spec on mass extinctions and alternate outcomes of previous extinction events they aren't really fun. They're literally cataclysmic
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And now, for something completely different
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LλmbdaExplosion
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May 30 2018, 05:43 AM
Post #653
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Vieja Argentea the oscar cichlid
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By "fun" i meant sarcastically
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When life give you lemons.............Don't make lemonade!Make life to take the lemons back!Get mad and than.........Yell,demand and burn down their homes.
Prepare for unforeseen consequences,Mr. Freeman!
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HangingThief
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May 30 2018, 06:32 AM
Post #654
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- LλmbdaExplosion
- May 30 2018, 02:25 AM
- HangingThief
- May 29 2018, 06:35 PM
- Cool_Hippo43
- May 20 2018, 05:15 PM
how and why mammals became viviparous? Why did the development of the fetus inside the mother replace the eggs? Could this happen to birds and reptiles, for example?
Eggs are vulnerable. Viviparity protects the fetus and makes it practical to provide offspring with a much bigger head start than eggs typically would. It has happened many times in reptiles among various groups of snakes and lizards. Some skinks even have a sort of placenta. There are also many fish, amphibians and countless invertebrates that give live birth to fully developed young.
Eggs are actually much efficient. But since mammals and few squamates give birth and it was successfull ,why not still keep this way of breeding since worked. Eggs are only more efficient when it comes to quickly producing large number of offspring. Mammals, most sharks and rays, many teleosts and and around a fifth of squamates use viviparity, it's obviously more efficient for them.
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Hey.
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ZoologicalBotanist
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May 30 2018, 09:56 AM
Post #655
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Would you all say that Wikipedia's list of living fossils is accurate, or is there anything that shouldn't be on there? On the other hand, is there anything that should be on there but isn't?
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LλmbdaExplosion
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May 30 2018, 03:26 PM
Post #656
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Vieja Argentea the oscar cichlid
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- ZoologicalBotanist
- May 30 2018, 09:56 AM
Would you all say that Wikipedia's list of living fossils is accurate, or is there anything that shouldn't be on there? On the other hand, is there anything that should be on there but isn't? Is not accurate at all.Crocodiles aren't living fossils,in fact none are.
The flaw is also in fish section: I'm pretty sure fish not mentioned such as catfish and cyprinds remained unchanged since late Jurassic too if we exclude derived ones.
Mammals-Okapis?Aardvarks?How?
The concept of living fossils sometimes is used without given context.An extant creature is modern.
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When life give you lemons.............Don't make lemonade!Make life to take the lemons back!Get mad and than.........Yell,demand and burn down their homes.
Prepare for unforeseen consequences,Mr. Freeman!
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Ivan_The_Inedible
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May 30 2018, 04:30 PM
Post #657
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There are some who call me... Spencer.
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- LλmbdaExplosion
- May 30 2018, 03:26 PM
- ZoologicalBotanist
- May 30 2018, 09:56 AM
Would you all say that Wikipedia's list of living fossils is accurate, or is there anything that shouldn't be on there? On the other hand, is there anything that should be on there but isn't?
Is not accurate at all.Crocodiles aren't living fossils,in fact none are. The flaw is also in fish section: I'm pretty sure fish not mentioned such as catfish and cyprinds remained unchanged since late Jurassic too if we exclude derived ones. Mammals-Okapis?Aardvarks?How? The concept of living fossils sometimes is used without given context.An extant creature is modern.
Okay, let's try to set this a little straighter. @Zoological Botanist For the most part I see little wrong with the article's list, being a pretty decent list of commonly-known(at least for those studying the clade) living fossils. If you wish to use it to help with any sort of projects, I see no reason not to. @LλmbdaExplosion Just about all the species listed that you have gripes about are living fossils, thanks to their (comparatively speaking) ancient lineages, relatively unchanged body plans, and lack of many closely-related clades. Even those carp and catfish of yours are younger and more diverse than the coelacanths, gars, and bowfins listed in the article.
"An extant creature is modern." It makes one wonder about how much of the article simply went in one otolith and out the other.
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ZoologicalBotanist
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May 30 2018, 07:08 PM
Post #658
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- Ivan_The_Inedible
- May 30 2018, 04:30 PM
- LλmbdaExplosion
- May 30 2018, 03:26 PM
- ZoologicalBotanist
- May 30 2018, 09:56 AM
Would you all say that Wikipedia's list of living fossils is accurate, or is there anything that shouldn't be on there? On the other hand, is there anything that should be on there but isn't?
Is not accurate at all.Crocodiles aren't living fossils,in fact none are. The flaw is also in fish section: I'm pretty sure fish not mentioned such as catfish and cyprinds remained unchanged since late Jurassic too if we exclude derived ones. Mammals-Okapis?Aardvarks?How? The concept of living fossils sometimes is used without given context.An extant creature is modern.
Okay, let's try to set this a little straighter. @Zoological Botanist For the most part I see little wrong with the article's list, being a pretty decent list of commonly-known (at least for those studying the clade) living fossils. If you wish to use it to help with any sort of projects, I see no reason not to. @LλmbdaExplosion Just about all the species listed that you have gripes about are living fossils, thanks to their (comparatively speaking) ancient lineages, relatively unchanged body plans, and lack of many closely-related clades. Even those carp and catfish of yours are younger and more diverse than the coelacanths, gars, and bowfins listed in the article. "An extant creature is modern." It makes one wonder about how much of the article simply went in one otolith and out the other. Thanks Ivan! I also found a more complete list under the living fossils category, so that will be a good resource as well.
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--Windblown-- I do not know where I will go. I travel where the breeze will blow. For I know, deep in my soul, I am windblown.
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LλmbdaExplosion
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May 31 2018, 02:30 AM
Post #659
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Vieja Argentea the oscar cichlid
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- Ivan_The_Inedible
- May 30 2018, 04:30 PM
- LλmbdaExplosion
- May 30 2018, 03:26 PM
- ZoologicalBotanist
- May 30 2018, 09:56 AM
Would you all say that Wikipedia's list of living fossils is accurate, or is there anything that shouldn't be on there? On the other hand, is there anything that should be on there but isn't?
Is not accurate at all.Crocodiles aren't living fossils,in fact none are. The flaw is also in fish section: I'm pretty sure fish not mentioned such as catfish and cyprinds remained unchanged since late Jurassic too if we exclude derived ones. Mammals-Okapis?Aardvarks?How? The concept of living fossils sometimes is used without given context.An extant creature is modern.
Okay, let's try to set this a little straighter. @Zoological Botanist For the most part I see little wrong with the article's list, being a pretty decent list of commonly-known (at least for those studying the clade) living fossils. If you wish to use it to help with any sort of projects, I see no reason not to. @LλmbdaExplosion Just about all the species listed that you have gripes about are living fossils, thanks to their (comparatively speaking) ancient lineages, relatively unchanged body plans, and lack of many closely-related clades. Even those carp and catfish of yours are younger and more diverse than the coelacanths, gars, and bowfins listed in the article. "An extant creature is modern." It makes one wonder about how much of the article simply went in one otolith and out the other. Don't lecture me on fish.I sleep,see and breath these things every day.Cyprinids as we know them evolved in Early Cretaceous alongside characins.The earliest characin unearthed is Santanicthys found in Albanian.Leuciscinae evolved during late Early Cretaceous from basal cyprinids such as loaches.A possible occurence in Africa also is not excluded.They are ostariophysi.Catfish could have a Pangea origin.Doesn't this ring a Bell?
Don't judge a group by diversity because these gars and bichirs could or will outlive cyprinids.
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When life give you lemons.............Don't make lemonade!Make life to take the lemons back!Get mad and than.........Yell,demand and burn down their homes.
Prepare for unforeseen consequences,Mr. Freeman!
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Beetleboy
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May 31 2018, 02:54 PM
Post #660
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neither lizard nor boy nor beetle . . . but a little of all three
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Don't lecture me on fish.
Jewel, in a PM to me:
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What impressions?
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So what i done wrong?
It’s your attitude, my friend, that’s what.
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