This interactive scatter plot visualizes the Iris flower dataset, with a dropdown menu to switch the x-axis between sepal length and width. Built with React and D3 v7, it renders SVG circles whose positions map sepal measurements to linear scales. The application fetches CSV data via `d3.csv`, computes extents with `d3.extent`, and uses `scaleLinear` for axes. Custom React components handle the x/y axes, dropdown, and data marks, with tooltips for values.