Problem: In early times, the privilege of papal election was not reserved to the cardinals, and for centuries the person elected was customarily a Roman priest and never a bishop from elsewhere. To preserve apostolic succession the rite of consecrating him a bishop had to be performed by someone who was already a bishop. The rule remains that, if the person elected Pope is not yet a bishop, he is consecrated by the Dean of the College of Cardinals, the Cardinal Bishop of Ostia.
Why did the ceromony of consecrating a bishop have to be preformed by someone who was already a bishop?
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Answer: To preserve apostolic succession

Problem: Education in Northern Ireland differs slightly from systems used elsewhere in the United Kingdom, but it is more similar to that used in England and Wales than it is to Scotland.
Which country is Northern Ireland's school system most different from?
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Answer: unanswerable

Problem: The economy of Himachal Pradesh is currently the third-fastest growing economy in India.[citation needed] Himachal Pradesh has been ranked fourth in the list of the highest per capita incomes of Indian states. This has made it one of the wealthiest places in the entire South Asia. Abundance of perennial rivers enables Himachal to sell hydroelectricity to other states such as Delhi, Punjab, and Rajasthan. The economy of the state is highly dependent on three sources: hydroelectric power, tourism, and agriculture.[citation needed]
What is Himachal Pradesh ranked in the highest per capita of Indian States?
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Answer:
fourth