Explain how different types of organism defend themselves against microorganisms. – 7026

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1. Animals:
   Skin – Has oil that kills microbes and a tough outer layer that’s hard to get through.
   Nose – Hairs trap dust and microbes.
   Trachea/Bronchi – Mucus traps microbes, and cilia move the mucus out.
   Stomach – Acid kills bacteria.
   White blood cells – Make antibodies and antitoxins, and they eat microbes.
   Plants:
   Cell wall – Tough barrier that stops microbes getting in.
   Waxy cuticle – Another tough layer that blocks microbes.
   Dead cells/bark – Fall off and take pathogens with them.
   Antibacterial chemicals – Kill bacteria.
   Fungi:
   Antibiotics – Kill bacteria.

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