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[–]Vari4 5 insightful - 1 fun5 insightful - 0 fun6 insightful - 1 fun -  (0 children)

Because age and weight would be there without humans (as would sexual reproduction); but species, race and sex are a layer we use to describe the world. Species isn't there to be discovered, we impose it to describe how animals cluster.

I'd start by pointing out that concepts of sex and species being part of the natural world play a key role in our explanations of which animals can and cannot reproduce with each other.

Without sex and species being part of the natural we would have no explanation for why organisms of the same sex cannot reproduce and why organisms of different species cannot reproduce (with some interesting exceptions regarding things like mules and ring species).

If this cretin responds by arguing that you cannot tell someone's sex just by looking then you should respond by asking if they wanna make a bet.