Given that the concept of race was defined by family/tribal grouping and observable physical features, which are biological in nature, to point out that it is biological is entirely tautological.

Of course it is biological. Doesn't stop it being an appallingly crap system for human taxonomy. Especially given that there are a very large quantity of people out there whom you would really have to give a long list for in this taxonomy, rather than a word, as people have a habit of not sticking to these neat little groupings when they have sex, even if you force them to with law.