What describes a series of events that happen over and over again?

A series of events that happen repeatedly is best described as a cycle. Cycles are characterized by their repetitive nature, where the same sequence of events occurs in a predictable manner, often influenced by consistent factors. For instance, natural cycles such as the water cycle or the life cycle of an organism illustrate how certain processes recur in nature.

While a pattern suggests a recognizable repeated arrangement, it doesn't fully capture the concept of time or recurring events within a specific framework as a cycle does. A loop might imply a continuous or circular path, often in programming or logic, but it does not inherently convey the concept of repeating events over time. A sequence refers more to a specific order of elements or events rather than their repetition.

Thus, the term cycle accurately conveys the idea of events occurring in a repeatable manner over time, making it the correct choice in this context.