Need your theory on how the dinosaurs became extinct.  How did volocanoes come into play?
465341
Holy cow-thats a Master's thesis project at least!  Ok, there are lots of theories out there concerning a cataclymic hit-and since both she and the people she is comparing also believe in the asteroid theory, we have to just think of all the things that could happen, reasonably:\nThe ashes from the volcanoes could block out the sun so drastically that it became too cold for the dinosaurs to live\nThe ashes blocked the sun out sufficiently to kill the major plant life, so the herbivorous dinos starved, and then the carnivores starved.\nThe volcanoes spewed out sufficient CO2 that the dinos suffocated\nThe volcanoes spewed out toxic gas that poisoned the dinos.\nThe volcanoes subtly changed the climate so that over thousands or hundreds of thousands of year, other lifeforms, such as mammals, birds, and the surviving reptiles, gains a major advantage and caused the dino extinction.\nAbout the meteor:  Either you could hypothesize that the volcanoes erupted spontaneously, and it had nothing to do with meteors, or that the meteors by themselves weren't a killing force but disrupted the crust of the Earth sufficient to open up volcanoes all over the Earth, or that the meteor alone killed most of the dinosaurs, and the resulting volcanoes killed off the rest.\nI didnt mention the effects of tsunamis and earthquakes caused by the volcanoes because that wouldnt reasonably be enough to kill off all the dinos.\nHope those ideas help-good luck.
659540
Many people have different theories on this one.  Here are a few of the more popular ones:\n\n1) A large meteor hit the earth, causing ash and debris to cloud the atmosphere for years.  This made it impossible for sunlight to penetrate the atmosphere, and all plant life dies.  Herbivours then died, due to a lack of food.  Soon after, carnivours died due to a lack of food (the herbivours.\n\n2) A climate shift caused the earth to raise its temperature by a few degrees.  This caused the above devistation (beginning with plants) by heat, instead of lack of sunlight).\n\n3) Disease.\n\n4) Large dinosaurs creating large amounts of methane (think herds of cows) caused global warming.  See #2 for result.\n\n#1 is the most believed-in theory, but that status changes from year to year.
497059
Satans rebellion caused dinosaurs to become extinct? what kind of horseshit is that????? my God mainworry If you were any dumber plants whould be laughing at you!!!
483713
I wouldn't say that I'm anymore intelligent than someone else, but I did want to answer your question, so....\n\nYou are confusing the theory of evolution (diversification of species) with the theory of abiogenesis (life from natural compounds).  That's okay, many people confuse the two.\n\n1.  How did life get from soup to single-celled organisms?  From wikipedia, "J.B.S Haldane suggested that the earth's pre-biotic oceans - very different from their modern counterparts - would have formed a "hot dilute soup" in which organic compounds, the building blocks of life, could have formed.\nIn 1953, taking their cue from Oparin and Haldane, the chemists Stanley L. Miller and Harold C. Urey carried out an experiment on the "primeval soup". Within two weeks organic amino acids, the basic building blocks of life, had formed. While Miller and Urey did not actually create life; they demonstrated that a more complex molecule — the amino-acids — could emerge spontaneously from simpler chemicals, in the presence of an external energy source in an atmosphere largely devoid of oxygen (the experiment involved shooting a spark, representing lightning, into their flask of supposedly primitive earth-gases)."\n\n2.  How did the original cell eat and develop asexual reproduction?   You are putting the cart before the horse.  In order to get to the cell stage, self-replicating molecules had to exist first... i.e. reproduction & "nourishment"  was occurring well before the cell stage.  Also, what are you referring to with "nourishment"?  For a self-replicating molecule, nourishment would consist of other molecules that it could combine with to form more of itself.\n\n3.  In the "soup", how did primordial cells develop resistences?  Resistence to what?  I don't understand this question.  To the environment?  To viruses or bacteria?  You need to elaborate here, I'm sorry.  I think it ties into your next answer, but not sure.  Please read my answer to #4.\n\n4.  How did it evolve everything it needed if it wasn't in it's DNA?  Can you give an example?  Hmm.  I'm trying to understand how you are approaching this question.  Let's say you have 100 little cells, each a little different.  5 cells can withstand a higher water temperature than the others because of a mutation they have.  One day the temperature goes up and kills off the other 95 cells.  That only leaves the 5 with the mutation.  They scamper off and reproduce like crazy... the cell strain has just evolved a little.  Now repeat this a gazillion times with a dynamic interacting environment and there you go.
749580
If the meteorite that struck the earth 600 billion years ago have not wiped out the dinosauraus race at that time, then also they would have became extinct by now.This is because the reason is the earth was much colder at that time before 600 billion years ago  than the present temperature of the earth. So even if the meteorite that struck at that time was not able to wipe the entire dinousauraus race, the heat generated by the meteroite struck on earth would certainly have erased their presence on earth. This made the dinosauraus support sytems critical for their survival. Moreover all the dinousauras didn't die on the same day of the meteroite struck. It took nearly thousands of years till they became extinct. This is because the heat, once generated, can't escape out into the space. It keeps on reflecting back to earth, as you aware of Greenhouse Effect.\nRegarding intelligence, since there was no sign of human presence at that time, there's actually no evidence whether the dinosauraus were equal to humans in terms of intelligence.\n\nGood Question.....!
531946
wow that was soooooo long ago,you must be really old.number one was the first t rex went extinct. sorry lol
380528
Dinosaurs were vertebrate animals that dominated the terrestrial ecosystem for over 160 million years, first appearing approximately 230 million years ago. At the end of the Cretaceous period 65 million years ago, dinosaurs suffered a catastrophic extinction, which ended their dominance on land. Modern birds are considered to be the direct descendants of theropod dinosaurs.
909586
Permian Extinction:  251-252 million years ago.  The reigning hypthesis is that emissions from a "supervolcano" in the area of Siberia caused global warming which triggered other changes.  Most species - animal and plant, land and marine - became extinct.  It's possible that one or two meteor strikes may have caused the increase in volcanism.\n\nK-T Extinction Event - 65 million years ago.  For several million years, something had occurred which decreased biodiversity;  we don't know what.  Then, a large meteor fell leaving a crater, evidence of which may be found near Yucatan Mexico.  This impact probably started fires all over the hemisphere, and kicked up dust and soot which blocked sunlight all over the world for years.  The climate change was enough to wipe out a fair number of land and marine species of plants and animals.  The dinosaurs and large marine reptiles became extinct.
634900
1) A mass extinction is an across the board extinction of many species, genre, and phylum. The most famous was the dinosaurs, not one survived. There were many species and genera that did not make it. The dinosaurs were not the only ones who perished in this mass extinction event.\n2) Second part is that it occurs in a relatively short period  of geologic time (few million years or shorter). \nWe do not know what caused the mass extinction in the past.\nA less significant extinction would have less groups involved, for example just a few species of a genre but most survive. \n We  can only speculate, we are pretty sure that the dinosaurs were wiped out by a major bolide impact about 60 million years ago off the ukitan peninsula. There is zircon found in concentrated amounts across the plants oceans witch is indicative of a bolide impact. Also about the same time there were major volcanic eruptions on the other side of the planet which is now India, the combination of the two, could have caused the mass extinction of the dinosaurs. Be careful when you watch science shows on NOVA or Discovery, a lot of the time they make scientific theory out to be a proven fact.
1138264
I can't remember the last time I really worried about a dinosaur....\n\nDo you worry about dinosaurs often?\n\nDid this worrying just start, or have you always been worried about dinosaurs?
923345
Crocadiles...\n\nSupposing that an impact was the cause of the dinosaur's demise, it would not have been an imediate death.  \n\nAn impact would have thrown dirt into the upper reaches of the atmosphere.  The Sky would have been dark day gray for a long time, and the Earth would have grown cold for years...\n\nThose animals that needed the most food would have died first, and in that order of sucession until the only survivors would have been the small scavengers.  The dinosaurs that could feed on the starved carcasses of the dead.\n\nAnd so the decendents of those survivors have had to continue to evolve to survive this colder and crueller Earth.  \n\nThe would have needed to develop an insulating layer...  Some will tell you the Birds evolved from those survivors, and if they are right then those feathers are a post-Impact survival trait...\n\nThe question has to be if there was an intelligent races of Dinosaurs...  I mean, if we suffered an equally destructive impact today, we wouldn't have the forewarning to see it coming even now...  How much of humanity would survive?  Forty Years of darkness and artic cold...
207254
As a late development of the dinosaurs Archeopteryx would have come extinct at the Cretaceous-tertiary boundary about\n66 million years ago (when all dinasaurs became extinct)the cause was a large asteroid that hit he earth off Yucatan in Mexico causing cataclysmic environmental changes.\n\nhttp://en.wikipedia.org/wiki/Archaeopteryx
12704
Glenn, I appologize if this comes off pretentious, but I would like to address part of your question. Unfortunately, it's not the part you probably want answered, but I feel it's the most important part of your question.\n\nWhen it comes to biology/evolution, to ask the question "why" is unanswerable. It's not the way things work when it comes to evolution. Things are the way the are now because of millions of years of selective pressures dictated all current living things into their current constructions.\n\nIn fact, the question "why" is nearly impossible to even consider when it comes to biology. Things are the way they are not for any particular reason. Maybe there were organisms that had developed a large "blowhole" like structure that was at the end of their nasal cavity. But for whatever reason, which may or may not had anything to do with the having two small nares or a bigger blowhole, environmental pressures allowed one organism to succeed and pass along their traits (including the nairs) and the other became extinct.\n\nWe can talk about structure's function that it provides, but that structure was in no way "designed" that way to provide that function. In fact that function may or may not have been essential to that organism surviving and passing along that trait. Some traits are simply along for the ride. In those cases it's other structures that provide increased fitness which allows certain organisms to outcompete and prosper through evolutionary time. \n\nIn the case of having two nares at the opening of the nasal cavity, I have no idea if this was a critical structure for the propogation of organisms on earth. I can make the guess, however, based on the fact that many animals do have similar structures, that this feature was present early on in evolutionary time. The fact that this trait has been maintained suggests one of two possibilites: either these stuctures do have some level of importance for organisms' fitness or 2) there is no real pressure otherwise that has forced a change from this trait that developed early on.\n\nIf there have been some insight gained which is true, I'm not aware. Hopefully someone who has that expertise will find your question and answer. In the meantime, I hope you will consider why the word "why" is not an appropriate place to start the path to finding out.
775178
Yes, that's definitely why dinosaurs were so big -- another moon pulling on them! Why haven't all these smart scientists thought of such an obvious answer? And I'll bet that second moon crashed into the earth and killed all the dinosaurs too.
1056378
i personally feel the meteor impact was the cause of the KT extinction - but people should not infer that the impact itself killed everything off - it was the fallout from the impact (the extremely versatile climate) which led to the dinosaurs being unable to adapt to it and dying off
1095774
Aliens (Morflocks) built large laboratories on Earth. And they genetically engineered them out of algae slime. But one day the chief Morflok Alien said", Look morflok the morfloks we morfloked are morfloking morfloked". \n\nSo they went into space and directed a large asteroid to strike the Earth near what is now  Bermuda, (effectively killing tourism there for millions of years.  \n\nBasically the Morflocks had decided that many of the dinosaur's temperament was rather unpleasant and quite nasty.  The Morfloks are a happy and joy-full race!\n I like that better than the Earth is only 9,000 years old (what the creationists teach.
477598
Perhaps... the weather during the early part of the Cretaceous was warmer than today (and more uniform.)  I'm actually in the process of writing a paper exploring the possibility of hadrosaur hibernation in northern Alaska.\n\nI took a tour of a dinosaur resource center today.  The tour guide said that ability to adapt is what saved KT survivors.  Crocodiles can go months without eating.  Birds migrate.  Fish could swim to deeper water.\n\nIt is still highly debated to what caused the Cretaceous Tertiary extinction.