D
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Explanation:
During implantation, the trophoblast differentiates into two distinct layers: the inner cytotrophoblast, and the outer syncytiotrophoblast.
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Answer:
Vomiting persists for more than two days.
Diarrhea persists for more than several days.
Diarrhea turns bloody, black or tarry.
Fever is 101 F (38.3 C) or higher.
Lightheadedness or fainting occurs with standing.
Confusion develops.
Worrisome abdominal pain develops.
Explanation:
Repetition- bullies tend to repetitively bully the same victim.