Question

correct the text by inserting one comma.
televisions and computer monitors are manufactured with materials that are a challenge to recycle so landfills are rapidly filling with electronic waste.

Explanation:

The sentence has two independent clauses: "Televisions and computer monitors are manufactured with materials that are a challenge to recycle" and "landfills are rapidly filling with electronic waste" connected by "so". A comma should be placed before "so" to separate the two clauses for proper punctuation.

Answer:

Televisions and computer monitors are manufactured with materials that are a challenge to recycle, so landfills are rapidly filling with electronic waste.