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.
1. A group of people that seeks to influence public policy on the basis of a particular common interest or concern.
2.As a reminder, a political party is a group of people who organize to win elections, operate the government, and determine public policy, whereas an interest group is a group of people who share common goals and who actively try to influence policymakers. ... Their specific purposes within the government, however, differ.
Answer:
<em><u>Dowry system is a social problem . Dowry is very prevent in Indian marriages where the groom demands some money or goods from the family of bride . ... It is a curse to the bride and her parents who have to bear gigantic cost to satisfy the irrational demands of the family of the boy.</u></em><em><u> </u></em>
Explanation:
<em><u>Hope</u></em><em><u> </u></em><em><u>it helps</u></em><em><u> </u></em><em><u>you</u></em><em><u> </u></em><em><u>✌️</u></em>
<em><u>Mark</u></em><em><u> </u></em><em><u>me as</u></em><em><u> </u></em><em><u>Brainleist</u></em><em><u> </u></em>
<em><u>Have</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>good day</u></em><em><u> </u></em>
Answer:
Cross-sectional research method
Explanation:
The Cross-sectional research method is a method of observational study design. Here, in this study the experimenter or the researcher measures and studies the outcome and and exposures in the study participants in the same time.
In the context, An experimenter studies the heredity and the intelligence of the MZ twins who are reared together and for those who are reared apart. The findings of the experiment made by the researcher is a result of a cross sectional research method in this case.
Answer:
Social stratification is a characteristic of society
, is maintained through beliefs that are widely shared by members of society. and different societies use different criteria for ranking their members. Persists over generations.
Explanation:
Social stratification in its most general sense is a sociological concept that refers to the fact that both individuals and groups of individuals are conceived as constitutive of greater or lesser degree, differentiated into strata or classes in terms of some specific or generalized characteristic. or in a set of features. That means that societies are what determine social stratifications. Another characteristic is that it is transmitted from generation to generation, for example Mark Zuckerberg will probably pass his wealth to his children and therefore social stratification will continue his cycle and thus from generation to generation.
