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Did you know?
Pearls are made by marine oysters and freshwater mussels as a natural defence against an irritant such as a parasite, secreting layers of aragonite and conchiolin which in turn creates "mother of pearl" which encases the irritant.pic.twitter.com/j2FWhr5BH1— Massimo (@Rainmaker1973) April 19, 2024
(photo: pixabay)
