kamiyahzanae427
kamiyahzanae427 kamiyahzanae427
  • 04-06-2020
  • Biology
contestada

Why are external barriers important to our immune system?

Respuesta :

maryamkhajehaminian1 maryamkhajehaminian1
  • 04-06-2020

Answer:

Maybe it was because external barriers can attack to our body and it can hurt us

Explanation:

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