>>12086048There are some animals which are considered different sub-species but which can produce viable offpring. And there are also cases where an animal can not produce viable offspring with their OWN species, such as asexual organisms.
The core of this problem is that "species" isn't really a feature of reality, it's just a convent classification tool. Sometimes it works, sometimes it's nonsense and can't be applied well.
In terms of applying the term to humans, it is not a matter of science or truth. It's just politicizing the term.
