Dinosaurs

No, they never existed. However, small mammals like mice lived during prehistoric times.

Spinosaurus was a land dinosaur that scientists think could swim. It lived in what is now North Africa.

depends how they sleep

some lay down and some sleep standing up like a guard

Hadrosaurus had teeth that were good for grinding plant matter, and a beak for clipping plants for food. Their jaws could chew, which is useful for animals that eat plants, but doesn't help those that eat raw meat. They also had no adaptations for eating meat, including sharp teeth, sharp claws, a strong bite force, and speed.

It is a commonly known fact that dinosaurs did suffer diseases, and many were probably similar to those of today. Although we haven't found any virus or disease-causing bacteria fossils, we have found certain dinosaur fossils that show their effects. Case in point, the Smithsonian Institution has an Allosaurusskeleton with some abnormal growth in its arm- possibly some form of cancer. One skull of a Lambeosaurus shows some pretty bad tooth deterioration. (which would probably hurt very badly for a beast with that many teeth!) There have even been two fossil Iguanodon specimens that show some arthritis in their ankles. The list goes on, showing what these creatures did, in fact, go through.

No. The belly button is a trait only found in mammals.

With the exclusion of birds, the last dinosaurs died out 65500000 BC. Birds, a subgroup of dinosaurs, however, are still alive in AD times.

Between 40 and 50 feet long and about 20 feet tall.

In short, Yes.

The most recent evidence shows that some dinosaur types did evolve into Birds. Some others may have evolved into other forms of life we have today.

The more evidence that we find, the less sure we are that 'dinosaurs' evolved into only one form of life.

Birds may in fact be the descendants of a 'maniraptoran' dinosaur. However it is not known at this time if other forms of dinosaurs evolved into other animals that we have today.

Crocodiles, alligators and tuatara are all descended from species which would now be termed dinosaurs.

a fictional character on Nickelodeon's show, Rugrats.

just one argentinosaurus the pack of t-rex would simply just win

There were small reptiles in the time of the dinosaurs, they just weren't the most dominant form of reptile on the planet. According to the theory of evolution, following the Cambrian period, most land animals were primitive reptiles that still had amphibian traits and habits. Over time, protein requirements, and the higher oxygen content of the atmosphere on earth millions of years ago, made them grow bigger and bigger. Also dinos were not true reptiles; they were a life form that was a cross between a reptile and a bird, dinosaurs were in fact a primitive species of bird, most of them featherless, hence they ressembled reptiles, but they weren't. Scientists have theorized as much, because skeletal remains of dinos have been found in places of the world were cold blooded animals simply could not have survived, not even in that earlier era.

Probably not. Current evidence suggests that the dinosaurs were wiped out by an asteroid impact, possibly in combination with an outburst of volcanic activity.

Parasaurolophus, Corythosaurus, Lambeosaurus,-in fact, all crested hadrosaurs, or duckbills, except for Tsintaosaurus. They breathed air into their crests, then mad a loud HOOT!

Brachiosaurus was up to 82 feet long and 52 feet tall! Brachiosaurus weighed up to 75 tons!

Dinosaurs existed at the very beginning of earth that we know of. They are extinct, so they are not really alive to this day. But you can find sculptures of dinosaurs in the museum. Check for some around you and the people there will help you with any questions you have.

There are two strategies, which are worked together. First, go to some area where the exposed rocks are the proper age for dinosaur fossils. Second, look around to see if any of them are "weathering out" of the matrix.

Mineralized bones and other hard parts tend to be a little bit more resistent that the surrounding rock, so as wind and water remove rock, sometimes the bones poke out. Of course, if nobody notices them and digs them out, they eventually weather away as well and we never know they were there.

Some places are particularly likely depositories, such as areas that WERE the terminus of streams because not only might bones have been washed down to them, but the slow-moving water there would have allowed fine particles of clay to settle over them -- just the stuff to make fossils in a few million years.

In any case, the skill of a paleontologist includes 1) patience in shifting, screening, washing and sorting little bits that might be bones and 2) experience in recognizing the things that are. Most fossil bones are little broken bits; it's only once in a great while that a huge solid thighbone or skull weathers out.

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Yes! Many dinosaurs such as stegosaurus and apatosaurus died long before the meteor hit Earth.

books, computers, libraries

"Jurassic Park"-type reconstitution is still out of reach, but who knows? Maybe someday DNA tinkering will produce creatures, which, is not actual dinosaurs, will be hard to tell apart from them.

Abrosaurus means "delicate lizard." This is because it was a 30 foot long sauropod, which is very small for a sauropod.

Remember that where it's tundra now was quite a bit warmer during most of dinosaur times. At some points there may have been no tundra at all.

The Ornithomimus lived in North America about 75 million years ago see link below