This interactive histogram visualization explores the Iris dataset, allowing users to select which numerical attribute to display on both the X and Y axes via dropdown menus. The visualization displays binned frequency data as semi-transparent bars, colored by the species of each data point using an ordinal color scale. It also overlays positional circles from the second histogram to compare the two selected attribute distributions. Built with React and D3 v7, the code utilizes `scaleLinear`, `scaleOrdinal`, `bin`, and `count` functions, rendering SVG elements with custom axis components.