Which life cycle type does Swamp morningglory exhibit?

Swamp morningglory, also known as Ipomoea aquatica, displays a life cycle categorized as either annual or perennial, which is reflected in the correct choice. This plant can thrive in various environmental conditions, leading it to exhibit variability in its life cycle. In some locations, it behaves as an annual, completing its life cycle in a single growing season, while in other scenarios, particularly in warmer climates or favorable habitats, it can persist for multiple growing seasons, thus displaying perennial characteristics. The ability to adapt its life cycle based on environmental factors is a key aspect of its biology, making this classification appropriate.

The other options do not fully capture the plant's variability. A classification strictly as an annual limits the understanding of its potential longevity in suitable conditions. Alternatively, labeling it solely as having a lifespan of 2 years inaccurately simplifies its life cycle, as the swamp morningglory can live longer under certain circumstances. Finally, defining it strictly as perennial ignores its capacity to behave like an annual in some environments. Therefore, the answer correctly encapsulates the diverse life cycle traits of swamp morningglory.