The term “ language” refers to any language that is commonly spoken in a specific are

The answer is the native language.

Explanation:

The Native language is used to refer to the language that a person learned when he or she was at home, he or she usually learned the language because of his/her parents. We can consider that children who grew up in bilingual homes have two native languages.

The first language is an important aspect related to the social and cultural identity of the child because through the correct use of language the child can have better relationships with other people. Some people consider that a  "native speaker" does not exist, but it is important to understand what could be the implications of considering a person as a "non-native" speaker in his/her life.  

The correct answer will be "Eutrophication caused by fertilizer and detergent runoff".

Explanation:

Dead Zones, particularly throughout the Gulf of Mexico, become generally caused through phosphates and nitrates load capacity from farmland.Agricultures in the Midwest which underground tunnels waterways as well as down the Mississippi and through the gulf coast whereby individuals choked out an existence.

So that the above would be the right choice.