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compound eye is given this name due many repeating units known as ommatidia

molecule made up of bound units of acetylglucosamine joined in such a way as to allow for increased points

chitin is a molecule made up of bound units of acetylglucosamine

spiders possess an exoskeleton composed of chitin molecule made up of bound units of acetylglucosamine

repeating hexagonally shaped units known as ommatidia hence the term compound

eye is seen to be composed of repeating hexagonally shaped units known as ommatidia

ommatidium is composed of separate units made up of a photoreceptor cell support cell and pigment cells
