This interactive scatterplot displays the Iris dataset, with each point colored by species (setosa, versicolor, or virginica) and sized by petal length. The visualization cycles through four feature pairs on the x-axis every few seconds, while the y-axis remains fixed on sepal length. Built with React and D3 v4, it uses `d3.scaleLinear`, `d3.extent`, `d3.axisLeft`, and `d3.axisBottom` to render axes and SVG circles, with a legend and axis labels added dynamically.