The Integration of Biology Content Lessons in the English Curriculum through

2.2.1. Individual Bilingualism.
The scholar states the idea that a bilingual person is able to use both languages, 
but each language is used with different purposes in different domains (school, 
neighborhood, home). In this way, a person could use for instance, Spanish to speak 
with family and English to speak at school or with friends (DIGLOSIA). Moreover, an 
individual could speak in both languages, but the competence and the proficiency in one 
of those languages is less than in the other. That is what Baker (2006) called dominant 
bilingualism, and it is observed when the balance between L1 and L2 is not the same in 
terms of proficiency, and one language dominates the other in certain 
contexts. Additionally, there is other type of people that could be proficient at speaking 
and listening skills, but not with reading and writing. For that reason, Baker made 
emphasis in the distinction between the abilities a person has when using both 
languages and the use of the languages for different purposes, and in different contexts.
Baker (2006), suggested two dimensions to explain the abilities and skills an 
individual uses in two languages. These are:
Oracy 
Literacy 
Receptive skills
Listening Reading 
Productive skills
Speaking Writing
Baker dimension of individual bilingual skills.
Taking into account the chart, Baker suggests that it is not possible to label a 
person as monolingual or bilingual since people’s abilities vary in the two languages. 
For instance, a person could be able to read and listen in one language, but is not able 

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to speak and write in that language. This is known as passive bilingualism since the 
individual is able to understand a second language, but is more difficult to produce 
communication by writing or talking. 
These types of bilingualism mentioned before explain the characteristics of a 
bilingualism focused on the individual aspects, but now, it is necessary to explain the 
bilingualism of society or a region.