This line chart visualizes the relationship between temperature and humidity from a plant growth CSV dataset, plotting humidity on the y-axis against temperature on the x-axis. The data is sorted by temperature, with each point rendered as a green circle and connected by a line using `d3.line()`. The chart uses `d3.csv()` to load the external data, `d3.scaleLinear()` for both axes, and `d3.axisBottom()` and `d3.axisLeft()` to generate tick marks. The SVG rendering includes labeled axes for temperature in degrees Celsius and humidity percentage.