Question

correct the text by inserting or removing commas. there should be a total of two commas. (note: in this skill, serial commas are not optional.) thomas alva edison built a laboratory twelve miles south of newark new jersey where he and his team developed countless inventions.

Explanation:

1. Add a comma after "Newark" to separate the city from the state (Newark, New Jersey), a standard punctuation rule for place names.
2. Add a comma after "New Jersey" to set off the non-restrictive relative clause "where he and his team developed countless inventions," which provides extra, non-essential information about the location.

Answer:

Thomas Alva Edison built a laboratory twelve miles south of Newark, New Jersey, where he and his team developed countless inventions.