http://en.wikipedia.org/wiki/Eye
In primates, geckos, and other organisms, these take the form of cone cells, from which the more sensitive rod cells evolved.Even if organisms are physically capable of discriminating different colours, this does not necessarily mean that they can perceive the different colours; only with behavioural tests can this be deduced.
In primates, geckos, and other organisms, these take the form of cone cells, from which the more sensitive rod cells evolved.Even if organisms are physically capable of discriminating different colours, this does not necessarily mean that they can perceive the different colours; only with behavioural tests can this be deduced.
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