Answer:
The correct version of the underlined sentence is:
Joelis just learned that because of increased levels of carbon dioxide in the atmosphere**. The oceans** are becoming more acidic.
This version uses a period (.) to separate the two independent clauses, which are complete sentences that can stand on their own. The other versions use incorrect punctuation marks, such as a comma (,), a semicolon (;), or no punctuation at all, which create run-on sentences or comma splices. A run-on sentence is when two or more independent clauses are joined without proper punctuation or conjunctions. A comma splice is when two independent clauses are joined only by a comma, without a coordinating conjunction (such as and, but, or, nor, for, so, yet).
I hope this helps you understand how to punctuate sentences correctly.
: [Comma Splices and Run-on Sentences]
Step-by-step explanation:
well it's actually 8 points still I can help you.