LINGUISTICS & CULTURE
|Data:||09/DEZ/2010 9:49 PM|
Actually you must use 2 commas in that sentence. One of the commas is placed before "or".
It does not use pharmacological, immunological, or metabolic media to perform its principal function in human beings.
I know that in Portuguese commas aren't placed before or / and, but in English they are, depending on each situation of course.
For more on commas:
Extended rules for using commas:
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