The comparative approach identifies correlations between traits and ecological variables. This means that A) differences in behavior between two related species may be due to natural selection. B) the correlations identified in one comparative study become more convincing if they later allow behavior to be predicted in a previously unstudied group. C) traits of related species are compared in different ecological settings. D) all of the above.

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The comparative approach involves comparing traits of related species in different ecological settings to identify correlations with ecological variables, suggesting that differences in behavior may be due to natural selection. When these correlations can predict behavior in unstudied groups, the findings become more convincing, encompassing all the options provided.

The Comparative Approach identifies Correlations Between Traits and Ecological Variables