http://en.wikipedia.org/wiki/Eye
Apposition eyes are the most common form of eyes, and are presumably the ancestral form of compound eyes. They are found in all arthropod groups, although they may have evolved more than once within this phylum.Some annelids and bivalves also have apposition eyes.
Apposition eyes are the most common form of eyes, and are presumably the ancestral form of compound eyes. They are found in all arthropod groups, although they may have evolved more than once within this phylum.Some annelids and bivalves also have apposition eyes.
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