Quite simply there would be mermaids, and a whole branch of mythology would be reality.
It would depend on which mermaid mythology is being referenced.
Not really. Mermaids come from the imagination of authors and are not real. If the author wants the mermaids to reproduce then he or she would write that into the story.
mermaids.
In mythology yes they are. but you have to do a hand gesture toward them as the old mythology books say then they will be all over you.
No. Mermaids don't exist and even in mythology that never happens.
Mermaids live in the Ocean, they do not live on land or in land.
nymphs
Mermaids are first mentioned in ancient Greek mythology, particularly in the works of Homer and Hesiod. They are often depicted as beautiful half-woman, half-fish creatures who live in the sea.
Girls are not born "with fins", and there are no "real mermaids", so the question is kind of pointless.
According to the mythology, they live in water because they are part fish. However, they don't really exist.
No, people cannot physically turn into mermaids as mermaids are mythical creatures and do not exist in reality. Mermaids are often depicted as half-human and half-fish creatures, but they are purely a product of mythology, folklore, and fiction.