To determine the height of the plant cells after 2.5 seconds, we would typically need to reference the scatterplot and identify the point corresponding to 2.5 seconds on the x-axis and its associated height on the y-axis.
However, since I do not have access to the scatterplot, I cannot provide a specific answer based on that visual data.
If you have access to the scatterplot, please look for the point that corresponds to 2.5 seconds and read the height value off the y-axis. If you can provide me with that information or any additional details, I'll be glad to assist you further!