Why are legal precedents, the English Magna Carta, and the writ of Habeas Corpus so important to law and government in New Zealand?

The correct answer for the question that is being presented above is this one: "The legal precedents, the English Magna Carta, and the writ of Habeas Corpus so important to law and government in New Zealand because it does not directly challenge the defendant’s conviction but instead challenges the authority of the state to incarcerate the defendant.