Lots of plants are hermaphroditic, but it doesn’t seem to be as common in animals
There are a variety of evolutionary biology theories that explain sex and the pressures that can lead to development or retention of separate sexes. I can’t remember the specifics, but it is indeed a subject of scientific inquiry.
There are some lizards that are only female and reproduce via parthenogensis, with no males, although most animals seem to have separate sexes.
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