No. Cannibalism is illegal everywhere.
I believe all semi auto guns were made illegal in 1996 due to the incident in Tasmania
No, it is not legal to have a marmoset, which is an exotic species, in Australia.
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The legal age to get married is 18. Most states will allow 16 and 17 year olds to get married with the permission of the parents. Younger is seldom allowed, but a few places allow it with a court...