Part V: The Part of Tens in VS .NET

Making Denso QR Bar Code in VS .NET Part V: The Part of Tens

Dinosaurs legs, for example, were directly under the body rather than off to the side, as is the case with lizards and crocodilians They didn t live at the same time as humans Modern humans have been here for only a few hundred thousand years, and the dinosaurs went extinct (mostly) 65 million years ago No one can claim to know what color dinosaurs were (the fossil record doesn t give information about color), though it s reasonable to assume that, like every other group of animals, they came in a variety of colors The largest dinosaurs may have weighed 100 tons or more Why the uncertainty Many dinosaur fossils are incomplete It s reasonably straightforward to come up with a good estimate of an animal s weight based just on its skeleton if you have a complete skeleton The largest dinosaur species for which scientists have found all the various bits is Brachiosaurus, which weighed in at about 30 to 40 tons, but bones from much larger species have been found Unfortunately, without all the bones, paleontologists can t be sure exactly what those dinosaurs looked like Some species had social behavior Fossilized tracks indicate that large groups of dinosaurs traveled together Nesting areas where several dinosaurs made nests together have also been found Evidence even exists that baby dinosaurs remained in the nest and were cared for by the parents (because fossils of young but not newly hatched dinosaurs have been found in nests) No one knows for sure what caused the dinosaurs to go extinct One theory is that a large meteor smashed into the Earth, raising a cloud of dust big enough to alter sunlight and weather around the globe As it turns out, scientists have found evidence that a large meteor struck the Earth around the time when the dinosaurs went extinct The geological boundary corresponding to the time when the dinosaurs disappeared contains a layer of iridium an element that is rare on Earth s surface but plentiful in some meteors; it would have settled on the Earth as dust from the sky after a meteor impact One group of dinosaurs is still around today You know this group as birds The bird lineage has its origin within the dinosaur branch of the tree of life an initially controversial idea that s now widely accepted The first scientific discovery of dinosaur fossils occurred in the early 1800s, but it s surmised that ancient peoples (such as the Romans and Chinese) discovered dinosaur fossils earlier Those fossils could be the source of myths about dragons and other fantastical beasts that crop up in lore and literature from ancient times

Archaeopteryx (see Figure 20-1) is an example of what is often referred to as a missing link Except of course that it isn t missing anymore because we found some! Archaeopteryx is a species of bird-like dinosaur that has many of the characteristics of modern birds feathers, wings, flying stuff like that But it also has characteristics typical of the dinosaur lineage from which it arose: most obviously its toothy grin! Archaeopteryx was discovered only a couple of years after Darwin published his book On the Origin of Species As he said in his 4th edition: Until quite recently these authors might have maintained, and some have maintained, that the whole class of birds came suddenly into existence during the eocene period; but now we know, on the authority of Professor Owen, that a bird certainly lived during the deposition of the upper greensand; and still more recently, that strange bird, the Archeopteryx, with a long lizard-like tail, bearing a pair of feathers on each joint, and with its wings furnished with two free claws, has been discovered in the oolitic slates of Solenhofen Hardly any recent discovery shows more forcibly than this how little we as yet know of the former inhabitants of the world