Fri March 11, 2011 By: Apoorv Kumar

Though eyes are found in many organisms, why can they not be grouped together ? (2 marks)

Expert Reply
Fri March 11, 2011
Dear student,
We do not consider only one characteristic like eyes while classifying animals. Otherwise all animals possessing eyes would be under the same group. We need to consider many similar characteristics to group the animals in a single species. Also we can include only those animals in a species which can interbreed with each other and produce fertile offsprings. 
(Eyes are believed to have evolved independently on many separate occasions, but they share a common set of light-sensing proteins, suggesting a common point of origin for all sighted creatures)
Regards, Team Topperlearning
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