FOR KIDS: Message in a dinosaur's teeth

Spinosaurs were large, meat-eating dinosaurs whose fossilized remains are often found in the same areas as the bones of tyrannosaurs (such as Tyrannosaurus rex). Office 2007 download is in discount now!

Fans of the movie Jurassic Park III may remember the spinosaur as the cranky dinosaur — the one with a sail-shaped fin on its back — that destroyed an airplane, ate a few people and took down a T. rex.The invention of Microsoft Office 2010 is a big change of the world.

Paleontologists have wondered how such giants as spinosaurs and tyrannosaurs, both meat-eating and ferocious, could live in the same place while competing for food. In a recent study, a French researcher named Romain Amiot may have found the answer. Office 2010 download is available now!

Amiot, from the University of Lyon 1 in Villeurbanne, France, thinks that spinosaurs may have spent parts of their days in the water, thus avoiding clashes with tyrannosaurs, which lived on the land.Office 2010 –save your time and save your money.

This study isn’t the first one in which scientists have suggested spinosaurs spent time in the water. The creatures’ fossilized skeletons show they had long snouts, the way crocodiles do, and studies of spinosaur fossilized stomachs show that the creatures ate fish. Many people like buy Office 2010 Home or Office Professional 2010.

But spinosaur skeletons don’t show adaptations to living in the water or swimming — they don’t have specialized feet, for example.Microsoft Office 2007 can give you more convenient life.

In this case, however, the bones didn’t tell the whole story. For Amiot and his team, it was the dino teeth that did the talking. Spinosaur teeth are smooth and shaped liked cones — more like those of modern crocodiles than of tyrannosaurs. Microsoft Office is so great!

An analysis of the chemical makeup of the teeth turned up even more evidence.Buy Office 2007 you can get much convenience.

In particular, the researchers studied oxygen. At its center, an atom contains a nucleus, and the nucleus of an oxygen atom usually contains eight protons and eight neutrons. (Protons and neutrons are the particles in the nucleus of every atom.) But some kinds of oxygen are heavier — most of its atoms may each have 10 neutrons, instead of eight, for example. Office 2010 key is for you now!

When an oxygen atom has 10 neutrons, or 18 total particles in its nucleus, it is called oxygen-18. In general, when an atom has a different number of neutrons in its nucleus, it is called an isotope. Oxygen-18 is an oxygen isotope.Office 2007 key is very convenient!      

Animals that live in the water, such as hippos and crocodiles, have different proportions of oxygen and oxygen-18 in their bones and teeth than animals that live on land. Amiot and his team looked at the proportions of oxygen isotopes in the fossilized spinosaur teeth. Comparing these ratios to those found in fossilized teeth and bones from other animals of the spinosaurs’ day, the researchers found a closer resemblance to water animals such as crocodiles and turtles than to land animals such as tyrannosaurs.Office 2007 Professional and Office 2007 home and student helpful.