What killed the dinosaurs?

Nova wrote:Why did sharks survive, but icthyosaurs die out?

Icthyosaurs, had already gone extinct by the time the KT extinction started, 65 mya, Icthyosaurs however died out 90 mya, when mosasaurs outcompeted them.

i believe that it was a mixture of the meteorite and plants that might have been the cause. as everyone knows, scientist believe that a meteorite hit the planet, but that doesnt necessarily mean that it is the main reason. what if, when the meteorite hit it cause a stirring in the earths plants, this caused them to react all over the world and cause most of the things scientist believe factored in the possible extinction of the dino. no man knows what a plant can truely do due to the fact that a plant can just as easily change as we can talk or walk. so there is nothing to say that plants couldnt have done something like release toxins and other things. this would also explain y many of the animals that lived in the water survived since nothing a plant can really affect the water unless it has a specially adaption in it like the diseases of our races ages.

I think that there are many factors to count when talking about the dinosaur extintion. Most people says that it was caused by the yucatan meteor, but I have another theory. Just as in JP2 novel says, there might be a non-evriomental problem. If not, why did the dinosaur extinton began befor the impact of the meteor? Before the meteor many types of dinosaurs where extint. Maybe a change in their behaivour, like it says in JP2, or another thing unknow at the time. In that times prior to the K-T limit also in a region near India there was a massive volcanic activity. Then there was a meteor impact somewhere that I don't remember. The sea life was stressing, the ecosistems were weak, and finally the meteor that impacted in Yucatan ended them definitly.

I think on earth was it colder and the Dinosaurs died!
But there was a lot of other factors!

Raging Raptor wrote:

Darth_Spino wrote: I mean dinos evloved into birds.

i somewhat agree

More evolution huh? Here it is agian, ROLL TAPE!

lol. my theory i made up myself is that i beleive that, yes, a meteor DID occure, but it was not the cause of a mass extinction. i beleive it just caused drastic changes in the enviroment.Some dinos addapted, some didnt. And the ones that made it, had to undergo major changes, under a great deal of stress and confusion, wich is, in my opinion, the Spark of evolution. When an animals entire species is under stress, confusion, and undergoing heavy changes, will cause them to start to evolve into something well-equipt to their ecosystem. They learned, grew, and thrived as they slowly evolved into the everyday creatures we see today. its a short theory that i could make a huge paragraph outta, but thats the basic idea of my theory.


EDIT

i believe that it was a mixture of the meteorite and plants that might have been the cause. as everyone knows, scientist believe that a meteorite hit the planet, but that doesnt necessarily mean that it is the main reason. what if, when the meteorite hit it cause a stirring in the earths plants, this caused them to react all over the world and cause most of the things scientist believe factored in the possible extinction of the dino. no man knows what a plant can truely do due to the fact that a plant can just as easily change as we can talk or walk. so there is nothing to say that plants couldnt have done something like release toxins and other things. this would also explain y many of the animals that lived in the water survived since nothing a plant can really affect the water unless it has a specially adaption in it like the diseases of our races ages.

hehe well you are forgetting that there is just about the same amount, if not more, plantlife in the oceans and bodies of water that are probobly more capable of evolution than we can begin to comprehend. The earths crust, is usually the same. The only thing that changes, changes slowwwlllyyy ever so slowly due to erosion. Other than weather, and man made changes, when we look out the window its all pretty much the same. nothing new, wich is basically why we invented the televisijon, to simulate a changing enviroment around us for stimulation, but, the ocean floor and underwater areas are eroding, rocks shooting up and slowly growing into a new look. If we had houses on the ocean floor, the landscape would change more in 1 month than it would 1 year in an average neighborhood, wich is why underwater, in my opinion, is something that throws out new changes in the ecosystem everyday, because of its delicate life circulation, MANY adaptations must be constantly made, wich is basically evolution summed up somehow in a way Darwin could not begin to understand. So the plesiosaur thrived so long, aswell as the crocodile and shark. Why? their ancestors where so used to changes, that they had no problem evolving to live in our world today.


THat is my 2nd theory, wich came out of my common sense