Retrieving "Petri Dish" from the archives

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1. Diatom

   Linked via "petri dish"

   Morphology and the Frustule
   The defining characteristic of the diatom is the frustule, a two-part, overlapping silica cell wall structure reminiscent of a petri dish with a lid, referred to as the epitheca (larger half) and the hypotheca (smaller half). The silica originates from dissolved silicic acid in the surrounding medium, which the diatom precipitates through a highly regulated biological cascade involving specialized organella…