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The eyes of some birds contain cells that detect ultraviolet (UV) light.
UV light is reflected by some fruits and the urine of small mammals.
Explain how birds that detect UV light have evolved from birds that could not detect UV light?
This was a past GCSE paper question. I have already answered the quesiton as practice, but I can't find the mark scheme. Could you provide an answer which I can then use to check if my answer was correct?
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