There are many different species of mostly the same animal… That differ only in the slightest details…
But humans despite evolving separately for a very long time are still the same species regardless of the race.
In: Biology
There is no single definition of species that applies to all groups of life, it’s just a sensible category. For example, there are way more bacteria out there evolving more quickly than we could ever categorize them, so when we work with them we sometimes use “operational taxonomic units” rather than species. These can be defined based on a similarity threshold, like everything of 97% sequence similarity being grouped together.
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