InterviewSolution
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InterviewSolution
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Evolution of eyes of humans had happened but why didn\'t it happen with that of planaria |
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Answer» It is not necessary that everything evolve . Evolution is caused due to differences in dna copying . Planaria have asexual mode of reproduction which causes very less chances of any difference in dna copying whereas in human sexual reproduction cause alot of differences so evolution is much faster....Maybe planaria can also get eyes if u wait for 9999999999999yrs ?? The early design of rudimentary eyes in the form of eye-spots was observed in Planaria which belongs to phylum Playhelminthes. Random changes created a depression in the light-sensitive patch making the vision sharper in animls like planaria.In insects, the light-sensitive spot gradually evolved into special layer with structures like ommatidia.Later, over a period of time, lens was formed in front of the eye. Vertebrates and octopuses developed the eye resembling a pin-hole camera wherein nerve fibres passed in front of the retinaFollow me @[email\xa0protected] |
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