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.
Arresting someone for criticizing the government or preventing people from following their religion.
I think it was because we really don't know what exactly happened in the past.
Also, I'm pretty sure people did not keep track of colored people back then.
<u>First year</u> students are more likely highest to adopt performance goals.
Compared to third-year students, first-year students adopted performance-approach and mastery-approach goals more frequently. Academic attainment in the first year was favorably connected with performance-approach goals.
The adoption of performance-approach goals was rated the highest by Chinese Australian students. More than other ethnic groups, Vietnamese Australian students adopted mastery-avoidance goals.
Students in their first year exhibited a stronger performance approach goal orientation than those in their third year.
Goals play a crucial part in human motivation.
1 Goals are cognitive representations of future objectives that a person is determined to either pursue or avoid. 2 Achievement objectives are a category of goals that have drawn a lot of attention in the educational industry for more than 20 years.
To learn more about Goals here
brainly.com/question/6478420
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Answer:
D) Participants
Explanation:
Students always think that the researchers are well organized and accurate because they pursue their research projects. Albert Einstein gives a confusing nature of the research as he said that if we already know that what we are doing then how it could be called research. Research is about that is not invented till the date. Because there is a more vast area of communication for research. Many researchers researching why we communicate and what is the purpose of the communication. Communication research is a vast topic for that we are inventing new and most confusing method. Communication technologies change from time to time such as Instagram, snap chat, etc but only human communication is still going in the same way.
