I have a 3 sets experiments (exposed to different concentrations of chemical) consisting of data sampled on 2 days (2 points), 5 days (5 points) and 10 days (10 points). All test measured were the same. The data were presented in line graph so its easier to look at the trend. However, the 2 points data look funny because there is only 2 points, someone suggested that data with only 2 points should not be presented with line graph but instead bar graph. However, it also not wise to use both bar and line graph in the same figure as I am comparing them in the same page. Share with me your opinion.