. Planaria, insects, octopus and vertebrates all have eyes. Can we group eyes of these animals together

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Ans. The  eyes  seen  in  planaria,  insects,  octopus  and  vertebrates  vary  greatly  in  their structure. These organisms can be used for studying evolution  of eyes as the eyes of planaria are simple without  lens, insects have compound eyes and  vertebrates  have highly  specialized  eyes. However,  all of them  perform  the same function,  that  is, vision. Thus, a common evolutionary  origin can be established.