This example demonstrates how to construct separate color and size legends using D3 v5. The color legend maps ordinal categories (apple, lemon, lime, orange) to distinct colors via `scaleOrdinal`, while the size legend uses `scaleSqrt` to represent numeric values with proportional circle radii. Both legends are built with reusable functions that accept `selection` and `props`, appending SVG groups with circles and text labels. The size legend filters out zero values and reverses tick order, displaying five ticks with semi-transparent black circles.