The correct answer is catalyst. Hope that helps.
Hello,
The prpuse of protiens is to help keep your body healthy and also it is to Repair anything broken torn or Fractred or Sprained
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D. because if they're not careful they become extinct by predators, then they have to be careful to survive by staying alert.
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autism
No because if you take that out , it acts like a skeleton so if you take that out, it will spill it contents out and won't really do any thing