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First off, if you are wondering why its in a box the graph(if someone ask why the graph is in a box), the directions read as follows:
Construct a graph demonstrating (a) the fundamental niche (the temperature and pH range in which the cells can grow) and (b) the optimum niche of each microbe with respect to temperature and pH.
The fundamental niche will be shown as a box on your graph – the height of box covers the whole pH range of the microbe’s growth, and the width covers the whole temperature range.
Your complete graph will have four boxes, one for each microbe.
The optimum niche for each microbe will be a point on the graph.