Bilingualism, multilingualism, and polyglottism all refer to the ability to speak and understand two or more languages.

Bilingualism has been shown to have many benefits in education, including improved academic performance, enhanced cognitive skills, and increased cultural awareness. There is no evidence to suggest that bilingualism makes it more difficult to learn a third language.

Dual language education is a type of bilingual education in which students are taught in two languages, typically their native language and a second language.

Subtractive bilingual education is not a type of bilingual education. It is a term used to describe the process by which a person loses their native language and adopts a second language.

Native language instruction, L1 instruction, and home language instruction all refer to the use of a student's native language in the classroom.

Improved academic performance is not a challenge associated with bilingualism in education. In fact, bilingualism has been shown to have many benefits for academic achievement.

Subtractive bilingualism is the process by which a person loses their native language and adopts a second language.

Bilingual education is not a factor that can contribute to subtractive bilingualism. In fact, bilingual education has been shown to help students maintain their native language and culture.

Multilingualism is the term used to describe the use of two or more languages in a society.

National multilingualism is not a type of multilingualism. It is a term used to describe the use of two or more languages in a nation.

Diglossia is the term used to describe the use of two languages in a society, with one language being dominant and the other being used in specific domains.

Increased academic performance is not a challenge associated with multilingualism in education. In fact, multilingualism has been shown to have many benefits for academic achievement.

Dual language education is a type of bilingual education in which students are taught in two languages, typically their native language and a second language.

One-way dual language education is not a type of dual language education. It is a term used to describe a type of bilingual education in which students from one language group are taught in two languages, while students from the other language group are taught only in the majority language.

Two-way dual language education is a type of bilingual education in which students from two language groups are taught in both languages.