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Home Q & A Board Biology-Related Homework Help Cell Biology
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RENCEE72 RENCEE72
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6 years ago
The immune system protects the body by distinguishing _____.
 
  A) inside from outside
  B) positive from negative
  C) self from non-self
  D) upper from lower
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hahauebfhahauebf
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6 years ago
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RENCEE72 Author
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6 years ago
Brilliant ツ
aricketts6@
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Yesterday
Thanks for your help!!
zsc999
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2 hours ago
You make an excellent tutor!
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