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Investigation Phase II: Are the tropics crowded?

To figure out if species are more densely packed in the tropics than they are in the rest of the world, we'll need more evidence.

		2. Imagine that you want to figure out whether species are crowded into the tropics or spread out evenly over Earth's surface. Which of the following sorts of data would be most useful to you?  A.  Average body size of species living at different latitudes.  B.  Average habitat size of species living at different latitudes.  C.  Population size of species living at different latitudes.  D.  Number of species per degree of latitude for different latitudes.  E.  Number of species per square mile for different latitudes.