(1) The Chesapeake colonists experienced shorter, less fertile lives than their New England counterparts. (2) In 1640, for example, Chesapeake migrants had no more than a 50 percent chance of surviving their first year in America. (3) Hot, steamy summers fostered repeated outbreaks of malaria and typhoid fever, which along with dysentery and poisoning from brackish drinking water, killed thousands. (4) Conversely, New Englanders lived longer for a variety of reasons. (5) For example, New Englandʹs drinking water was safe although Puritans generally preferred home-brewed beer, and the harsher winter climate helped kill off deadly germs. (6) As a result, the Puritans enjoyed longer, healthier lives. (7) In New England, 20 percent of all Puritan males who survived infancy lived into their seventies, and even with the hazards of childbirth, Puritan women lived almost as long. How many examples does the writer use to develop the topic sentence?