Mermaids are mythical creatures first seen in literature from Syria dated to be written during 1000 BCE.  Since then, mermaids have appeared in countless stories.  As their physiology is not well defined, it is impossible to say how their reproductive system works.  In fact, the first mermaid was simply a Goddess who elected to go into the water and take the form of a fish.  However, the Goddess wanted to keep her beauty intact, so she kept her upper half.  In this scenario, there would be no reproductive physiology to evaluate as this is a mythical creature that does not exist.
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