C. You need a comma when the sentence changes subjects from humans to bottlenose dolphins.
Explanation:
correct sentence all are correct if im right make me
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4. Alymer was obssessed with Georgianna's birthmark but not because its beautiful but because he's a scientist and he's obssessed with the possibility of it's removal.
It describes the word arrived. Arrived is the verb and late describes how he arrived. Hope this helps!