(a) Comparing harvest (in kg) of different grain crops from a farm:
The best data transformation, in this case, would be to use a bar chart or a line chart to display the data. These types of charts are well-suited for comparing the values of different categories (in this case, the different grain crops) and can clearly show the differences in harvest between the crops.
(b) Comparing amount of water loss from different plant species:
The best data transformation, in this case, would be to use a bar chart or a line chart to display the data. These types of charts are well-suited for comparing the values of different categories (in this case, the different plant species) and can clearly show the differences in water loss between the species. Alternatively, a scatter plot could also be used to display the data, allowing for the relationship between the amount of water loss and the type of plant to be visualized.