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An object that stops things getting through or past it.
barrier
the living thing that a parasite infects
host
A sticky substance found in our noses, windpipe and other air passages
Mucus
a substance that keeps insects away
repellent
protection against something
defence
Keeping yourself and the things around you clean
hygiene
any living thing that lives on or in the body of another living thing
parasite
living things that spread diseases but do not get the diseases themselves
vectors
