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.
I’m pretty sure it is all of the above. And also biology would be the subject for this question for future reference. Anytime
I think the answer is the second one
Answer:
Retirement Age;Working Age Adulthood;Young Middle Childhood;Children of Immigrants;Grandchildren of Immigrants.
Explanation:
Rosa and Ernesto joined their children in the United States. They tell lots of stories of the "homeland" to their grandchildren but don't go out a lot because they don't speak English. Retirement Age
A. Natalia came to the United States for a better job. While she has been successful, she still struggles with English and does not feel fully integrated into the culture. Working Age Adulthood
B. Abdullah came to the United States with his parents when he was 10. He speaks English fairly well and has adapted well to the new culture.
Young Middle Childhood
C. Tau's parents immigrated to the United States four years before he was born. He and his parents argue over acceptable behavior and expectations.
Children of Immigrants
D. Joya's grandparents immigrated before her parents were born. She knows that this happened relatively recently, although she doesn't see her ethnicity as her own experience but rather part of her family history.
Grandchildren of Immigrants.
The age at which people immigrate and not just their generation has a major impact on their roles in the family's acculturation or socialisation.
