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Trilobites were rapidly evolving and widespread marine organisms that spanned a number of geologic time periods. Certain types of trilobites only appeared in specific segments of geologic time; therefore, when one of these trilobites is found, you can be certain that the rock layer it is found in is of a certain geologic age.
Answer:
The very idea of the British Raj—the British rule over India—seems inexplicable today. Consider the fact that Indian written history stretches back almost 4,000 years, to the civilizationcenters of the Indus Valley Cultureat Harappa and Mohenjo-Daro. Also, by 1850, India had a population of at least 200 million.
The destruction that resulted from war or siege including the purposeful burning of an enemy city’s fields.