Soapberry bugs use needlelike “beaks” to feed on seeds within the fruits of various plants. bugs feed most successfully when their beak length matches the size of the fruit on which they are feeding. for 25 years, populations of soapberry bugs in central florida have been feeding on small goldenrain tree fruits that were introduced to the area, rather than on the larger native balloon vine fruits that serve as food for other soapberry bug populations. beak lengths of soapberry bugs are variable, but the average beak length is shorter in soapberry bug populations that feed on goldenrain tree fruits than in populations that feed on balloon vine fruits, as shown in the graph. how does natural selection act on beak length in soapberry bug populations?