Fort Collins enjoys a moderate climate, and boasts 300 days of sunshine a year. Fort Collins enjoys a moderate climate and boasts 300 days of sunshine a year. Fort Collins enjoys a moderate climate, and it boasts 300 days of sunshine a year. Use the final comma in a series of three or more elements. This will eliminate the confusion that can result when the final comma is not used.
Course work is required in natural sciences, arts and humanities, and business.
Do not include in the same series another element or elements that should be part of another clause or series. The rooms share a living room, kitchen, and have their own bathrooms. The rooms share a living room and kitchen and have their own bathrooms. Do not use commas if all the elements in a series are joined by conjunctions. Two-word introductory phrases do not require commas if their omission does not lead to confusion.