'Q9: The picture shows a cane toad, a natural predator of insects. The cane toad is native to South America but was introduced into Australia in the 1930s. Why were cane toads introduced into Australia? To be farmed for food B To be kept as pets To increase the biodiversity of Australia To control populations of sugarcane- eating insects'
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Step 1: The cane toad was introduced into Australia in the 1930s. Show more…
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About 70 years ago, cane toads were introduced to Australia. The toads are toxic to some species of snakes, such as Dendrelaphis punctulatus. The longer an individual snake is, the greater its chance of survival after eating a cane toad. Which of the following did scientists most likely observe in the D. punctulatus snake population as a result of the presence of the cane toads? A. The entire population was killed by the toads. B. The entire population became resistant to the toads. C. The average body length in the population increased. D. The average body length in the population decreased.
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A scientist observed two populations of insects for 10 years. They took data on the length, in mm , of the insect’s mouthparts. Their data is shown in the graphs below. How is this population evolving and what agent of evolution is most likely at work? a. inbreeding, because the gene distributions are becoming less similar among the population b. genetic drift, as the distribution of traits has become more random c. gene flow, as the population has likely gained new mouthpart traits through immigration d. natural selection, as insects that have mid-sized mouthparts are being favored
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