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.
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1. <span>A class system is much more open than other systems; it is based primarily on money or material possessions which can be acquired. - <u>true</u>, because you either go up or down the social ladder depending on how much you earn.
2. S</span><span>ocial class membership also affects child rearing, educational attainment, religious affiliation, political participation, the crimes people commit, and it also affects contact with the criminal justice system. - <u>true</u>, because whether you belong to a higher or lower social class might determine the perks you have in life</span>
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I would have a Partnership because the advantages of a partnership is the business can see more than just what one person offers but what the partner can offer as well, if one of the employers isn't there the other can watch the businesses while he is away. the disadvantages of a sole proprietorship is if one person is running it there are less ideas, and less people to watch the company, and harder for one person to juggle the mess of an employer. the disadvantages of a corporation is there is just chaos no one person to lead the herd. there isn't someone to round up everyone if need be. Everyone just does what they want to do
Explanation:
-Put the events/happenings in proper order from earliest to latest.
- Label each historical event.
- Include full sentences and information for that historical happening.
- Use only important descriptive details for that specific happening in the timeline.
