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Investigation Phase I: Is the LDG real?

One way to study the LDG is to collect data on how many different species are found in different parts of the world. The sample graphs in the multiple choice item below show the number of species found at different latitudes on Earth.

Multiple choice
1. Which of the following graphs would support the idea that the LDG is real?

Remember that the equator is at 0° latitude! The North Pole is at 90° north and the South Pole is at 90° south.

 A.  B.

 C.  D.