Transplantation experiments have shown that, when placental mammals are brought to Australia, they often survive and reproduce just as well as, if not better than, the native Australian marsupial mammals. One conclusion that can be properly drawn from these results is:
A. if Australian marsupial mammals were brought to North America, they would survive and reproduce just as well as, if not better than, the native North American placental mammals.
B. marsupial mammals reached Australia first and evolved to fill in the niches that placental mammals fill in other places.
C. placental mammals reached Australia first, but the later-arriving marsupial mammals were better adapted to the environment in Australia and outcompeted the placental mammals.
D. female marsupial mammals give birth to offspring at an earlier stage in development than female placental mammals.
E. the placental mammals that were brought to Australia were artificially selected to do better in the Australian environment than the marsupial mammals that were already present in Australia
Answer: B. marsupial mammals reached Australia first and evolved to fill in the niches that placental mammals fill in other places.
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