Take another look at the sentence:

Davina, a good friend from my biology class, has more interest in what is under a guy's skin than what is under his clothes, for this reason, she is pursuing a degree in radiography.

The comma between class and has is correct. Davina has more interest ... is a main clause. A good friend from my biology class is an appositive, a noun phrase. In the example above, the appositive is interrupting the flow of the sentence, so it requires a comma both in front and behind it.

Go back to the sentence to try again.

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