Defence mechanism.

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Across
  1. 1. the living thing that a parasite infects
  2. 3. The main muscle responsible for breathing is a dome-shaped structure below the lungs that contracts and flattens to enable lung expansion.
  3. 4. Living things that spread diseases but do not get the diseases themselves
Down
  1. 1. keeping yourself and things around you clean
  2. 2. A mosquito-borne disease caused by Plasmodium parasites, resulting in symptoms like fever, chills, and flu-like illness, affecting millions of people worldwide.