In some research, the researchers are not able to use random assignments to divide participants among groups. Instead, they compare preexisting groups, which results in a quasi-experimental design.
Random assignments are those which are given as a matter of chance to ensure fairness and equal opportunity for all participants. Here participants forming multiple groups are with similar characteristics. So all groups are the same at the start of the experiment.
A quasi-experimental design applies a non-random method, and subjects are assigned to preexisting groups. There are some situations where true experiments can't be used for practical reasons. In such cases, a quasi-experimental design is a suitable tool.
To learn more about quasi experimental design here
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Answer: a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders. a Germanic barbarian by the name of Odoacer took control of Rome. He became king of Italy and forced the last emperor of Rome, Romulus Augustulus, to give up his crown. Many historians consider this to be the end of the Roman Empire. With the fall of Rome, many changes occurred throughout Europe. The collapse of the Roman Empire in the fifth century. Two of the main events of the Fall of Rome were the plundering of the city of Rome by an invading tribe, the Vandals, in the middle years of the century and the abdication of the last Roman emperor, Romulus Augustulus, in 476.
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Fire cake was a type of bread eaten by soldiers in the Revolutionary Wars (French, Indian and American Revolutionary Wars). The bread was made from flour, water and salt and it was cooked on a rock in the fire. This was the only food available back then for men on the battlefield because there weren’t enough resources to make other meals. Also, back then they couldn’t preserve food, so the only solution was to make dry meal.
A good index fossil is one with four characteristics: it is distinctive, widespread, abundant and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms. That being said, certain land organisms are useful in young rocks and specific regions.
