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a minute life form (especially a disease-causing bacterium)
thin structure composed of a single thickness of cells
an abstract place usually conceived as having depth
make or form a layer
with one layer on top of another
a hen that lays eggs
a small simple structure (as a fertilized egg) from which new tissue can develop into a complete organism
single thickness of usually some homogeneous substance
a relatively thin sheetlike expanse or region lying over or under another
the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
anything that provides inspiration for later work