Explain what an IM is,

Which of these is most responsible for differences between the twentieth century to the twenty-first century?

Can someone work out the answer as it comes up in one of my computer science exams and i don't understand the cryptovariables

Kiesha has a worksheet with a range of cells using the following columns: name, score, group, study group, and date. kiesha needs to sort the worksheet on the date field. which option she use to most efficiently complete this task ? a use the cut and paste option to reorganize the data to fit that order b use the filter function to organize the data based on the date c use the order function to organize the data based on the date d use the sort function to organize the data based on date order