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unit 1 mastering biology

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Which of the following is an example of the pattern of evolution? (Overview)

descent with modification
natural selection
the inheritance of acquired characteristics
the fossil record of the evolution of modern cetaceans
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What happened in the soapberry bug population in central Florida when the bugs began to feed on smaller goldenrain tree fruits?

The length of each bug's beak gradually became shorter over time.
Bugs developed short beaks, because they needed them to feed on the small fruits.
Bugs with shorter beaks had more access to food, allowing them to produce more offspring.
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?

The action of natural selection on beak length in soapberry bug populations varies with the environment.
Natural selection increases beak length in soapberry bug populations.
Natural selection decreases beak length in soapberry bug populations.