The following questions refer to the description below. You have read that soapberry bugs,Jadera haematoloma,adapt to available food sources.For example,in southern Florida,soapberry bugs feed on seeds of a native plant,the balloon vine.In central Florida,the balloon vine is rare and soapberry bugs have switched to eating seeds of an introduced species,the goldenrain tree.The seeds of the goldenrain tree fruits are much closer to the fruit surface than the seeds of the native balloon vine fruit.As a result,natural selection results in beaks that are shorter in soapberry bugs that utilize goldenrain tree fruits than those that feed on balloon vine fruit seeds. -Which of the following observations helped Darwin shape his concept of descent with modification?
A)Species diversity declines farther from the equator. B)Fewer species live on islands than on the nearest continents. C)Birds can be found on islands located farther from the mainland than the birds' maximum nonstop flight distance. D)South American temperate plants are more similar to the tropical plants of South America than to the temperate plants of Europe. E)Earthquakes reshape life by causing mass extinctions.