The Catholic Church is not divided into several churches. All are united under one Church led by the Vicar of Christ on Earth - the pope. Within the Church there are several rites, such as the Latin or Roman Rite, the Maronites, the Ukrainian Catholic Church, etc., but all are Catholic. The only differences are in the language used as well as some variations of the liturgy.
Latin is the language of the Catholic Church because it has been used for centuries as the official language for religious texts and ceremonies, providing a sense of continuity and universality among Catholics worldwide.
The languages used in the Catholic Coptic Church can be known as many things as it is written in the Ethiopian rite and the Alexandria rite (were the Coptic Church is from) the languages used are Icelantic.
it wasused by the catholic church in academic situations.
Up until about 1963 the universal language was Latin
The English Catholic Church is just that, a Catholic Church in union with the pope in Rome. It is no different from any Catholic Church elsewhere in the world except that the language used is English. While the Church of England (Anglican Church) claims to be "Catholic" they are not in union with the pope in Rome so are considered as a Protestant denomination and not Catholic.
Latin.
It was used by the Catholic Church and in academic settings
There is no "Roman" Catholic Church: Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is rarely used by the Catholic Church. The Chaldean Catholic Church is part of the Catholic Church.
Most plainchant was written in Latin. This language was used in liturgical practices within the Catholic Church, and plainchant served as the musical foundation for these ceremonies.
The Roman Catholic Church used Quechua to preach Christianity.
It's just the Catholic Church, not the Roman Catholic Church. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is rarely used by the Catholic Church.