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The inner rear surface of the eye which contains photoreceptors it called the retina.
The innermost layer of the hair is the Medulla.
The center of an eye ball contains a transparent substance known as aqueous humor. The back of the eyeball, closest to the brain, is where the light-sensitive retina is located.
Film or Paper
the pistil and stamen
the innermost part of something
retina
The 5 layers are:EpitheliumBowman's MembraneThe StromaDecemet's MembraneEndothelium
The middle.
The innermost part of an object is called its core.
The pistil is the innermost whorl of the flower
Core