What is the difference between rna and dna in terms of nitrogenous base?

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• People often use the words town and city interchangeably yet I suspect there are official and practical differences between them. What exactly distinguishes a town from a city in terms of population size governance facilities and administrative status?
• Choosing a career can feel overwhelming especially when regional opportunities differ. For someone living in Odisha which jobs are considered the best in terms of growth stability and income across public and private sectors?