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That depends entirely on their physiology and the circumstances. If you have a fish that feeds mostly by harvesting the floor, for instance, natural selection might favour fish with stalks around the mouth for scanning the bottom and eyes on top to keep watch for predators.

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Q: Which fish will natural selection favor?
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Related questions

When natural selection favor the intermediate version of a characteristic it is called?

stabilizing selection


How can natural selection favor different phenotypes at different times?

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