paulse775
paulse775 paulse775
  • 03-05-2021
  • Health
contestada

Which statement describes many of the structures involved in the first line of defense of the immune system?

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Itismethedoglover
Itismethedoglover Itismethedoglover
  • 03-05-2021

Answer:

They have contact with the external environment.

Explanation:

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