mucus – n. a thick liquid that is produced in some parts of the body

slimy – adj.  thick and slippery

secretion –​ n. the production of a liquid by part of a plant or animal

disrupt – v. to cause something to be unable to continue in the normal way

intruder –​ n. something that is not welcome or wanted in a place

petri dish – n. a small, shallow dish that has a loose cover and that is used in scientific experiments especially for growing bacteria
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