what is mesoderm, ectoderm,endoderm ?
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Ectoderm is one of the three primary germ layers in the very early embryo. The other two layers are themesoderm (middle layer) andendoderm (most proximal layer), with the ectoderm as the most exterior (or distal) layer. It emerges and originates from the outer layer of germ cells
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A germ layer is a primary layer of cells that form during embryogenesis.The three germ layers in vertebrates are particularly pronounced; however, all eumetazoans (animals more complex than the sponge) produce two or three primary germ layers. Some animals, like cnidarians, produce two germ layers (the ectoderm and endoderm) making them diploblastic. Other animals such as chordatesproduce a third layer (the mesoderm), between these two layers. making them triploblastic. Germ layers eventually give rise to all of an animal’s tissues and organs through the process of organogenesis.
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