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All animals with eyes or eyespots that have been studied so far share a gene in common. When mutated, the gene Pax-6 causes the lack of eyes in fruit flies, tiny eyes in mice, and missing irises (and other eye parts) in humans. The sequence of Pax-6 in humans and mice is identical. There are so few sequence differences with fruit fly Pax-6 that the human/mouse version can cause eye formation in eyeless fruit flies, even though vertebrates and invertebrates last shared a common ancestor more than 500 million years ago. The appearance of Pax-6 in all animals with eyes can be explained in multiple ways.Based on the information given, which explanation is most likely?
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