Secret Life of a Mermaid Wiki
The Bizarre Tales of Four Lesser Known English Mermaids
Season 4: Episode 5: Fire & Ice
The Secret Life of Melusine: Mysterious Mermaid & Serpent Mother of European Nobility
Amy's cousin Andy comes over, and the girls race to find her and find out what they did the previous day.
It would then seem that humanity emerged from the water at different times, in different places.