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2. Germ layer - Wikipedia

   en.wikipedia.org/wiki/Germ_layer

   A germ layer is a primary layer of cells that forms during embryonic development. [1] The three germ layers in vertebrates are particularly pronounced; however, all eumetazoans ( animals that are sister taxa to the sponges ) produce two or three primary germ layers.

3. Photomask - Wikipedia

   en.wikipedia.org/wiki/Photomask

   In photolithography, several masks are used in turn, each one reproducing a layer of the completed design, and together known as a mask set. A curvilinear photomask has patterns with curves, which is a departure from conventional photomasks which only have patterns that are completely vertical or horizontal, known as manhattan geometry.

4. Cloth face mask - Wikipedia

   en.wikipedia.org/wiki/Cloth_face_mask

   A cloth face mask is a mask made of common textiles, usually cotton, worn over the mouth and nose.When more effective masks are not available, cloth face masks are recommended by public health agencies for disease source control in epidemic situations to protect others from virus-laden aerosols emitted by infected mask wearers' as they breathe, talk, cough, or sneeze.

5. Try This Sheet Mask Hack to Determine Your Skin Type - AOL

   www.aol.com/lifestyle/try-sheet-mask-hack...

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6. Category:Germ layers - Wikipedia

   en.wikipedia.org/wiki/Category:Germ_layers

   Pages in category "Germ layers" The following 6 pages are in this category, out of 6 total. This list may not reflect recent changes. ...

7. Gastrulation - Wikipedia

   en.wikipedia.org/wiki/Gastrulation

   These three germ layers are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). [3] [4] In diploblastic organisms, such as Cnidaria and Ctenophora, the gastrula has only ectoderm and endoderm. The two layers are also sometimes referred to as the hypoblast and epiblast. [5] Sponges do not go through the gastrula stage.