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Evolution is true, it happens, it is the way the world is, and we too are one of its products. This does not mean that evolution does not have metaphysical implications; I remain convinced that this is the case.
He uses convergence as his foundation, defining it as "the recurrent tendency of biological organization to arrive at the same 'solution' to a particular 'need'" and offering a multitude of examples, including eusociality, olfaction, and the generation of electrical fields. In outlining the direction and inevitability he believes is inherent in evolution, Conway Morris stacks up compelling evidence in the form of a revealed "protein hyperspace" that limits the possibilities of amino acid combination to a few, often repeated (pre-ordained?) forms. While he skirts a focus on the relentless environmental pressures that result in adaptation, Conway Morris also derides the notion that the gene rules evolution. He accuses his opponents (primarily Stephen Jay Gould and Richard Dawkins) "genetic fundamentalism" who use "sleights of hand, special pleading, and sanctimoniousness... trying to smuggle back the moral principle through the agency of the gene." Dense with examples and complex biological proofs, Life's Solution is not an easy explanation of convergence for general readers. Still, it is a clear and exciting elucidation of the theory that evolution might have predictable outcomes, even for those who find Conway Morris' metaphysical arguments unconvincing. --Therese Littleton
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While many folks are familiar with a handful of examples of convergence (the camera eye and those marsupials in Australia come to mind), it is remarkable how pervasive the phenomenon is. In fact, although I still don't know what to make of it, Conway Morris convinced me that convergence is a fact about the world that deserves more attention than it has received.
But the book is much more than a mere compendium of examples. For Conway Morris uses the ubiquity of convergence as a counterweight to the almost orthodox view that the history of life is a governed by a large helping of luck and accident, and that, to paraphrase S.J. Gould, if we reran the tape of life's history, it would have turned out entirely differently. Convergence suggests that, whatever the role played by happenstance, natural selection has worked under narrow constraints built into the structure of reality.
Conway Morris concludes the book with some perhaps preliminary discussions about the possibility of religious and scientific understandings of the world peacefully co-existing. Here as elswhere, Conway Morris only hints at certain ideas rather than pursuing them exhaustively. As a result, some reviewers have written unfair and uncharitable things about the book. But I, for one, was left with much to ponder, and with the hope that Conway Morris will continue his provocative explorations.
The issue of whether life history has an arrow of destiny at all (rather than random bumbling that may occasionally hit an anthropomorphic jackpot) is still up in the air. Natural selection certainly produces environmental adaptation over the fine grain of centuries and millenia. And over millions of years, an increase in complexity has been observed in such esoteric organs as arthropod appendages and crinoid feeding nets. But at the grandest scale, we have little to go on other than Victorian ideas that reptiles were bested by mammals in a great Darwinian struggle, which is nonsense. Bad luck - a bad asteroid - wiped out the dinosaurs, leaving empty space that mammals could fill. 180 million years earlier, it was the ancestors of mammals that drew the short straw.
But Conway Morris, unusually, isn't interested in whose sperm survives the apocalypse. Since environments cleave form to function, the same general biological properties arise everywhere. So New Caledonia, lacking mammalian predators, evolved giant flightless birds, the tigrish Sylviornus, with hooked beaks. (They were wiped out by the ancestral Polynesians, with good reason). Aping Darwin's writing, "Life's solution" is a book of examples, an accumulation of examples of convergence in action. This structure lends the book a bitty texture; it says the same thing over and over again, so reading five pages at a sitting will not lose the thread. This makes it an ideal book for busy readers.
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