The immune system helps you protect yourself from intruders (Bacteria, viruses and etc). When talking about adults and kids Immune system it is a whole different ball game. Adults and kid immune system are so far apart from each other that, Adults have more resistance to some bacteria and Virus while sadly, some kid doesn't have that much resistance or Immunity to fight off these bad guys. Now for the question, what do adults have in their immune systems? more what?
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Just pick the most sensible answer and it's correct: Memory cells.