Five fruit circles enter the SVG and gradually expand, showing the general update pattern for data joins. The code uses a `d3.ordinal` scale for color and radius, mapping apple and lemon types, while `selection.data()` with an id key, `.enter()`, `.merge()`, and `.exit()` manage transitions. Timed updates remove apples, change one to a lemon, and filter another, all animating over 1-second durations. The example relies on d3.v5 and SVG transitions.