The Cretaceous-Tertiary extinction event, or the K-T event, is the name given to the die-off of the dinosaurs and other species that took place some 65.5 million years ago. For many years, paleontologists believed this event was caused by climate and geological changes that interrupted the dinosaurs’ food supply. However, in the 1980s, father-and-son scientists Luis (1911-88) and Walter Alvarez (1940-) discovered in the geological record a distinct layer of iridium–an element found in abundance only in space–that corresponds to the precise time the dinosaurs died. This suggests that a comet, asteroid or meteor impact event may have caused the extinction of the dinosaurs. In the 1990s, scientists located the massive Chicxulub Crater at the tip of Mexico’s Yucatán Peninsula, which dates to the period in question.
Dinosaurs roamed the earth for 160 million years until their sudden demise some 65.5 million years ago, in an event now known as the Cretaceous-Tertiary, or K-T, extinction event. (“K” is the abbreviation for Cretaceous, which is associated with the German word “Kreidezeit.”) Besides dinosaurs, many other species of mammals, amphibians and plants died out at the same time. Over the years, paleontologists have proposed several theories for this extensive die-off. One early theory was that small mammals ate dinosaur eggs, thereby reducing the dinosaur population until it became unsustainable. Another theory was that dinosaurs’ bodies became too big to be operated by their small brains. Some scientists believed a great plague decimated the dinosaur population and then spread to the animals that feasted on their carcasses. Starvation was another possibility: Large dinosaurs required vast amounts of food and could have stripped bare all the vegetation in their habitat. But many of these theories are easily dismissed. If dinosaurs’ brains were too small to be adaptive, they would not have flourished for 160 million years. Also, plants do not have brains nor do they suffer from the same diseases as animals, so their simultaneous extinction makes these theories less plausible.
13 climates hope this helps have a nice day
Carnegie decided that he was going to be a capitalist who concentrates on one industry - the steel industry. He constructed his first steel mill in the around 1875. The profit he made from this steel mill allowed him to buy up other nearby steel mills. As Carnegie's empire grew, he bought up more of the competing steel mills. His purchase of Allegheny Steel contributed to the formation of his monopoly because it was one of his last major competitors. The definition of a monopoly is a company or enterprise that is the only seller of a certain product. By the time Carnegie had finished buying up his competitors, his company was the only company left in the steel industry.
Food and water are essentials but, air is a resource we need to only bring around in space.
yw, I have been losing brainliests since last week, please mark me it so I can get em' back
Answer:
children are abducted because eiether hey aren't tough properly or the adult is stronger and can easily take them.
Explanation:
yes ik its sad but ppl are gross so
