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The first rats introduced to New Zealand were the Polynesian rat or kiore. They came with the Maori settlers in around 1300.
Indians introduced it.
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I assume you mean "When was the first operating system introduced?" Seems to be in the 1950s. See the link below for a very detailed page.
1965
The first mathematician is Arya bhatt.
Ancient Greece, around 500BC.
It depends on the preschool, but the teacher might be called Ms and their first name or Ms or Mrs. and their last name. Often it is Ms and their first name. The title of a person who teaches preschool is usually "preschool teacher."
Preschool was first set up by a teacher who decided that sending children straight to Kindergarten after headstart was to much. Preschool is set up to prepare children for Kindergarten.
The MaoriThe Maori are New Zealand's first nation peoples.
Christianity is a Pakeha (non-Maori) religion but Maori do not fail at it; Maori like other Polynesians, are a deeply spiritual people. Many maori did embrace Christianity when it was first introduced to Aotearoa New Zealand. This was partly due to the attitude of Europeans who treated non-christians as little more than animals. Other Maori created their own syncretic religions that had a veneer of Christianity in order to protect their Maori beliefs which the Europeans wanted to stamp out. Maori in fact excelled at Christianity because Maori is an oral tradition where everything is memorised, so Maori were able to easily memorise the entire bible and thus engage in Christian theology very successfully.
Maori was indeed the first lnguage in New Zealand, being spoken by the indigenous peoples, the Maori. Maori is already one of the three official languages of New Zealand, English, Maori, and New Zealand Sign Language. Though Maori is the language of the first nations people, the Maori, it is not spoken by the majority of the peoples of the country. And English is a widely spoken language internationally.