This retired historian of science thinks it might even be okay to question the “biological ‘species’ concept”:
As a nonagenarian and former historian of science, I know that even foundational building blocks can be questioned. The unifying patterns of the periodic table are now seen, under closer scrutiny, to be riddled with anomalies and paradoxes (E. Scerri Nature 565, 557–559; 2019). Some scientists now wonder whether the concept of biological ‘species’ contributes more confusion than insight, and whether it should therefore be abandoned (see go.nature.com/2offaav). However, such a decision would affect conservation policy, in which identification of endangered species is crucial — so it is not just an issue for basic science.
Science students generally remain unaware that concepts such as elements and species are contested or are even contestable.
Jerry Ravetz, “Stop the science training that demands ‘don’t ask’” at Nature
Actually, the biological species concept is the foundation of Darwinism but apart from that, it is often conceptual clutter.
Perhaps conservation policy should focus on maintaining healthy ecologies and let the life forms sort out their relationships in their usual somewhat fuzzy way. They don’t owe it to us to prove Darwin right.
See also: A physicist looks at biology’s problem of “speciation” in humans
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