... abiotic factors directly affect the plant species growing in a particular area, and so the species would vary more along B. The preferable arrangement of line transects would be A. The main reason for this is that the stations are situated at comparable locations. All the transect lines are measured in the same way, making comparisons/averages between the lines easier. Secondly, the distance between each station is kept at a constant distance, so comparison of station to station is also facilitated. Here is a line graph showing the number of species in relation to distance from the high tide mark. A line of best fit has been plotted on the graph. As you can see, as the distance from the high tide mark increases, the number of species increases too. This is due to the composition of the sand dunes. Close to the high tide, only minimal species of plants will ...

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