What is wrong with run- on sentences?

What is a sub theme? Between 1870 and 1885 the majority of immigrants to the US came from Western Europe After 1890 the majority came from what region? How would you use shrilly in a sentence? Sample of Introducing a guest speaker? What is the best approach to conceptual database design database? Why do some people have 2 letters and others have 3 letters in their UK birth certificate reference number? What is a informal brief? What postcode is Malahide? Where was most of the English population living in 1750? What were Aristotle's classifications of governments? Is this right sentence 'he could not attended in any of his lessons'? Continent with the largest population and where is it and wich city is it in? What are the major cities in Alaska? ZIP Code booklet for US? Can you put the word spitefully in a sentence? How do you make a sentence with consequential? What is net social benefit? What is Watrap's population? What is the population density of La Nouvelle-Beauce Regional County Municipality? How do you use in a sentence overboard?