The answer is 'the broad application of the Fourteenth Amendment to state policy'.
In 1837, the incorporation of the Bill of Rights into the Fourteenth Amendment had gain an opportunity but was rejected by the Court. After the Slaughterhouse Case, the Court decided to effectively short-circuited any future development of the privileges and immunities clause.
The anwser is 2 if your not religious pls don’t read this
I believe that the question refers to Australia and to the fact that it's been very isolated and that as a result it has developed a number of species which cannot be found anywhere else.
The series of events here would be 1. the geographical isolation of Australia. it separated from the other lands 99 million years ago and 2. the frequent changes in climate it experienced which led to population bottlenecks, for example it was initially very warn and then it experienced a colder period.
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