Five apples sit in a row, then the bowl loses an apple, swaps one for a lemon, and drops another apple. The animation demonstrates the general update pattern, using `transition.duration(1000)` to smoothly animate new, existing, and exiting circles. The D3 v5 code uses `data(fruits, d => d.id)` with `Math.random()` IDs, and while an `enter` state starts radii at zero, no explicit `update` transition is defined, though the merge transition applies to all circles.