What defines an evergreen tree?

An evergreen tree is defined by its ability to maintain its foliage throughout the year. This characteristic allows the tree to continue photosynthesis and maintain its aesthetic appearance even during winter months when deciduous trees, which drop their leaves annually, become bare. Evergreens have adapted to various climates, enabling them to thrive in conditions where other trees may not. This trait also contributes to their ecological role by providing habitat and food for various wildlife year-round. The other choices do not accurately define an evergreen tree, as they refer to different types of trees or growth patterns.