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By definition, the addition of oxygen to a substance is called
Chorion
Outermost extraembryonic membrane of amniotes; major component of the placenta in placental mammals.
Epidermis
Outermost tissue layer. In animals, the epithelial layer of skin. In plants, the dermal tissue.
Mesoderm
Middle tissue layer of a three-layered animal embryo.
Ectoderm
Outermost tissue layer of an animal embryo.
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