Human beings have all the genetic machinery except one little piece for us to be able to make our own vitamin C. In fact rats and some other animals can.
Long ago, when our ancestors had access to plentiful citrus (or whatever else has vit C) that little mutation blipped our ability to make it 'in house' and it wasn't much of a negative mutation till sailors started taking long voyages and got scurvy, a disease caused by insufficient vitamin C in the diet.
Long ago, when our ancestors had access to plentiful citrus (or whatever else has vit C) that little mutation blipped our ability to make it 'in house' and it wasn't much of a negative mutation till sailors started taking long voyages and got scurvy, a disease caused by insufficient vitamin C in the diet.
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