Biology's solution to the species problem is mostly to say "look, you all know what we're talking about and we have better things to study" which is reasonable and necessary. The species problem becomes more a philosophical issue than a scientific one.
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But he did make a mistake in elevating the Organism as the exclusive unit upon which selection acts. Turns out wrong because the biological hierarchy (Macromolecule|Cell|Tissue|Organ|OrganSystem|Organism|Population|Community|Ecosystem) suffers from its own Species Problem.
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Said twice: the species problem also applies hierarchically and I love it. It's another spot where biology overlaps with philosophy/epistemology/the meaning of language.
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If the minimum definition of an organism is “behaves like life”, then some computer programs or a single RNA strand could be considered organisms.
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If an "organism" is a self-sufficient being with its own unique DNA, then you are more of a colony than an organism, as you require the workings of your mitochondria and gut bacteria to survive, all of which contain their own genetic code.
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If you want to consider your body as the walking vat that holds your brain, then you start to consider yourself an organ or an organ system. I'd recommend you don't do this, but that's a different discussion.
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If the families of mitochondria living within your cells are not organisms themselves but support structures for a larger organism, then perhaps you yourself are simply a support structure for a larger “Humanity” organism.
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The categories within the hierarchy are as (needfully) reductive as the concept of a species. Definitional barriers are so easily crossed as to be functionally nonexistent, and if nature does not recognize an organism, how could natural selection operate exclusively upon it?
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Modern evolutionary theory reinvigorates multilevel selection, a difficult concept Darwin once had to dispense with in order to move the theory forward. It's a fascinating history, and if you want to read more in depth I'd suggest Stephen Jay Gould and Thomas Kuhn
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in summary, biology always verges on soft science, but economics, social science and psychology are never sciences at all since they depend on non-falsifiable assumptions, and Kim Cattrall is 100% in the right while SJP can burn in the scorching winds of Jahannam.
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