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No, no dinoasur fosils were found since 65 million years ago, suggesting they were all killed off. Humans came no more than 7 millon years ago.
An asteroid impact killed the dinosaurs. This is the most widely accepted reason.
The theory: A large asteroid struck Mexico, forming a 240 kilometre wide crater. Resulting debris created a deposit of white powder in the atmosphere. This 'nuclear winter' blocked out the sun, killed plants, then plant-eaters and, finally, meat-eaters. How likely? Those dismissing the theory claim that smaller reptiles like turtles, alligators and crocodiles would also have been harmed; others argue the crater simply wasn't large enough to have caused such devastation.
Comet and cosmic rays killed the dinosaurs.
The theory: A massive comet travels close to Earth every 26 million years, bringing with it radioactive debris that collides with our planet, disrupting weather patterns and wiping out entire species, just as it did the dinosaurs some 65 million years ago. How likely? We have no concrete evidence of extraterrestrial events occurring at the point of dinosaur extinction. Furthermore, dinosaur remains show no evidence of radiation damage.
Volcanos killed the dinosaurs.
The theory: Western India saw huge volcanic eruptions which unleashed enormous quantities of lava, blocking out the sun, causing widespread climatic change and wiping out the dinosaurs. How likely? Deadly iridium in the Earth's 'K-T boundary' could conceivably have been caused by lava eruptions. However, scientists have widely agreed that 65 million years ago there was a global fall in temperature; a volcanic eruption would have had the opposite effect.
An ice age killed the dinosaurs.
The theory: Ice ages have occurred throughout Earth's history, with the last one ending about 10,000 years ago. A very severe ice age altered climates and froze waters to the extent that dinosaurs were unable to weather the conditions, and slowly died out. How likely? This theory has been largely discarded for one simple reason: scientists have not found a single scrap of evidence of an ice age occurring during the life of the dinosaurs.
Hay fever killed the dinosaurs.
The theory: Flowering plants known as angiosperms arose around 65 million years ago, creating a mass allergic reaction among dinosaurs. How likely: Not very! Flowering plants were around for millions of years before the dinosaurs disappeared and we have no evidence whatsoever that their pollen was capable of killing the dinosaurs. Plus this wouldn't explain the massive marine extinction - there have never been any marine angiosperms.
Obesity killed the dinosaurs.
The theory: The dinosaurs got too big and heavy, so much so they couldn't move about, defend themselves or withstand their own weight! How likely? There is absolutely no evidence to suggest the dinosaurs became so large and cumbersome that they couldn't move. Simply put, it is an evolutionary impossibility. Besides, most dinosaurs around by the end of the Cretaceous period were of medium or small size.
Mammals killed the dinosaurs.
The theory: The ecosystems of Earth 65 million years ago were such that mammals were out-competing the dinosaurs for food and space. How likely? Evidence points to a simultaneous evolution in dinosaurs and mammals, and some believe mammals did eat dinosaur eggs. But it's unlikely that mammals and dinosaurs had similar diets, so competition wouldn't have occurred. And there were no marine mammals at the time, so they couldn't have wiped out marine reptiles.
Disease killed the dinosaurs.
The theory: Towards the end of the Cretaceous period, land bridges opened up between places such as Asia and North America, allowing species to migrate. This led to a spread of disease to which other animals were not resistant. How likely? It could happen - Native Americans were nearly wiped out by smallpox, while the European invaders were resistant. But this argument fails to explain the disappearance of a multitude of species that lived in the sea.
Climate change killed the dinosaurs.
The theory: Earth gradually changed in climate over a long time period and the dinosaurs were not able to adapt to the cooler, drier climate. How likely? Climate change could have come about because Earth somehow tilted over about 23.5 degrees around 65 million years ago. How likely? Tilting could have occurred but what could have caused it. Asteroid impact? Debris from a passing comet? Scientists have never been able to answer this question.
Nothing killed the dinosaurs, they evolved!
The dinosars weren't killed they evolved!
The theory: Dinosaurs were not wiped out, they evolved into birds. There were certainly feathered dinosaurs and early birds resembled small meat-eating dinosaurs. Could it be that dinosaurs still walk - or fly - among us? Most scientists agree there is considerable evidence for many species of carnivorous theropod dinosaurs such as Velociraptor evolving into birds. But not all dinosaurs evolved into birds; Tyrannosaurus Rex died out with no evolutionary trace.
What else can I help you with?
What animal often attacked Lewis and Clark?
dinosaurs
Who came first dinosaurs or human?
Humans came after Dinosaurs.
Why aren't you dinosaurs?
We aren't dinosaurs because we are human beings.
Can dinosaurs human being?
Yes they can
What did the dinosaurs do?
On special occasions dinosaurs gathered in circles to celebrate the lack of human beings.
Why is subject of dinosaurs is so fantastic to human beings?
Because no one have seen dinosaurs
Are dinosaurs Christians?
Animals do not embrace religion of human being. Therefore, tagging dinosaurs as Christians is not proper.
Which dinosaurs was discovered by human?
A cave man and the scientist
How many dinosaurs attacked the t rex?
Probaly Nano-Tyranno was the only one to attack a T-rex
Did humans cause the extinction of dinosaurs?
No. Humans and dinosaurs never met. Dinosaurs died out 65 million years ago. The human race is about 200,000 years old.
Was prophet Adam living with dinosaurs?
According to most scientists, dinosaurs were extinct by the time human beings came around.
What extinct animals are there that lived before human life?
dinosaurs
