Refer to the Figure

question 10

Multiple Choice

Refer to the figure.
Which of the following statements is most clearly supported by the data in the figure?

• A) The current latitudinal gradient in species richness is likely due to much higher speciation rates in the tropics than in temperate regions over millions of years.
• B) The current latitudinal gradient in species richness is likely due to greater environmental stability in the tropics across hundreds of millions of years.
• C) The current latitudinal gradient in species richness could invert if average global temperature decreased substantially.
• D) The current latitudinal gradient in species richness could invert if average global temperature increased substantially.

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