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https://www.canva.com/design/DAFX-88VBWY/zdaep3IoqI4BFsSQijeDPA/view?utm_content=DAFX-88VBWY&utm_campaign=designshare&utm_medium=link2&utm_source=sharebutton

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Depending on the age of a human, it's easier to acquire two languages. A human born in a bilingual family core is more probable to become bilingual because of the exposition to two languages during childhood. Instead, it´s harder for adults to have a good domain of two languages due to many factors:

Mother tongue interference

Long time exposed to just 1 language

He/SHE is beyond the critical period

The human brain has a period of development and when this period is ending it tends to damage the brain, in this case, we talk about adult learners and it depend on the degree of cerebral damage if they will be able to acquire another language or not.

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Types of bilingualism according to the contextof acquisition

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Types of bilingualism according to the contextof acquisition

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Native Bilingualism: A language that individuals possess because they are from the same country but have foreign influences that allow them to learn both their native language and a foreign language. An example would be a child living in Spain with American parents who speak English at home.

Acquired Bilingualism: Bilingualism is acquired when a native speaker learns a foreign language until she masters and uses it. For example, a child whose native language is Spanish learns English from an early age and eventually becomes proficient in the language.

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Knowledge of systems theory and systems methods in general and the methods used in research is very important for the professional development of every researcher at the postgraduate level.

Research considerations at the methodological and teaching level distinguish the elements of the use of this theory and systematic approach, as well as the need to express a qualitative character in the studied system, which creates new characteristics and properties that are promoted by research based in the guarantee of theoretical order.

The use of the structural-functional systemic approach as a methodological guide for the study of the holistic development of the natural sciences.

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https://view.genial.ly/63c5d7857af2650011dbeb44/presentation-bilingualism

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According to the moment of language learning

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According to the moment of language learning

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Simultaneous bilingualism: learning two languages at the same time, that is, learning at the same time.
Continuous Bilingualism: First learn one language and then gradually learn the second language.
Receptive bilingualism: After learning the mother tongue, a person can only read and listen in another language and cannot express themselves orally or in writing.

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Wildner Cardozo, R. (2012). A review on the theories of bilingual development. BELT - Brazilian English Language Teaching Journal, 2(2). Retrieved from https://revistaseletronicas.pucrs.br/ojs/index.php/belt/article/view/9638

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Social bilingualism: the acquired ability by a person to communicate independently and alternatively in two languages. This also applies to the existence of two languages in the same region. Bilingualism and bilingualism: the most prestigious language corresponds to the highest social class, while the least prestigious language is spoken by the lowest social class.
Bilingualism without bilingualism: Normally one of two languages is used. Bilingualism without bilingualism: It occurs in very unequal societies where the language of the most powerful groups does not match the language used by the rest of the population. Communication between the two groups is only possible through interpreters. Personal bilingualism: it is the ability of a person to learn two languages and decide when to use one or the other language in turn.