(i) The eyes seen in each of these organisms vary differently in their structure but all of them perform the same function of vision. Thus a common evolutionary origin can be established on the basis of eyes.
(ii) "Birds have evolved from reptile", this can be justified as follows :
(a) Fossils of certain dinosaurs or reptiles show imprints of feather along with their bones but they could not fly presumably using the feathers for insulation.
(b) Later, they developed and adapted feathers for flight, thus becoming the ancestors of present day birds.