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germ layers

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