Things like genus and species are not naturally occurring, strictly defined, dividing lines. They are human created labels for trying to understand and categorize things. They are not perfect and they are not exact. Heck scientists don’t even agree on what the exact definition is or what belongs in each category all the time when it comes to species.
Take any two organisms, the more closely they are related the better the odds they can produce a fertile offspring together. Get far enough apart and the chances drop to zero (for a number of reasons) but it’s fuzzy up til that point.
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