Given the task definition and input, reply with output. You are given a list of queries separated by new line. Your job is to answer with the query that is the most well-formed or well-structured query in terms of grammar, punctuations, or spelling errors.

What is difference between speedand velocity ?
What is the primary purpose of RNA ?
What are thing that the telegraph did ?
What were the customs of iron age burials - tollund man ?
What is the primary purpose of RNA ?