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danielarincon26 danielarincon26
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6 years ago
The first line of defense against microorganisms and infection entering the body is the person's:
 
  A) gastrointestinal tract.
  B) mucous membranes.
  C) hair.
  D) skin.
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bericky97bericky97
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6 years ago
This helped my grade so much Perfect
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Correct Slight Smile TY
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