Which features are unique to the Apple Watch Series 8 compared to previous models?

The features unique to the Apple Watch Series 8 include temperature sensing, improved health monitoring features, and enhanced battery life. Temperature sensing is a notable advancement that allows for more detailed health tracking, particularly in relation to menstrual cycle tracking. This feature is designed to provide insights into users' body temperature changes over time, which is not available in earlier models.

Additionally, the health monitoring features in the Series 8 have been upgraded, incorporating more sophisticated capabilities that offer better tracking of various health metrics, building on the health functionalities of previous versions. Enhanced battery life means that the Series 8 can last longer on a single charge, catering to users who rely on their watch throughout the day.

In contrast, the other options highlight features that are standard across multiple models or have been present since earlier iterations. For example, water resistance and GPS capabilities have been available in previous Apple Watch generations. Customizable watch faces and third-party app support have also been part of the Apple Watch experience for several years, and cellular capability was introduced long before the Series 8. Therefore, the uniqueness of features in the Series 8 distinctly sets it apart in the lineup.