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Which of following is the best way to correct this run-on sentence?
When the biology class identified a new species of
butterfly they took careful notes they also took detailed
pictures.
A. When the biology class identified a new species of butterfly. They
took careful notes. They also took detailed pictures.
B. When the biology class identified a new species of butterfly, they
took careful notes. They also took detailed pictures.
C. When the biology class identified a new species of butterfly. They
took careful notes. They also took detailed pictures.
D. When the biology class identified a new species of butterfly, they
took careful notes, they also took detailed pictures. They

Answer :

Answer:

B. When the biology class identified a new species of butterfly, they  took careful notes. They also took detailed pictures.

Explanation:

Run-on sentences are when two or more independent clauses are improperly connected. This means that the independent clauses are joined in such a way that the sentence seems awkward and incorrect.

In the given sentence, the first part is a dependent clause as it begins with a subordinating conjunction "when". The second and third parts of the sentence are independent clauses.

Now, a dependent clause requires an independent clause to be a complete sentence so, the dependent clause and the second sentence will be joined together with the use of a comma in between. Then, the third sentence will be a separate sentence of its own.

So, the correct answer is option B.