Column
Biology
Creed
7 min read

Not just red in tooth and claw: biology's big debates

In the second of a series, biologist and priest, Andrew Davison, examines why it’s important to keep up with biology’s big debates.

Andrew works at the intersection of theology, science and philosophy. He is Canon and Regius Professor of Divinity at Christ Church, Oxford.

An osprey, in flight, holds a fish in its claws.
‘Wherever there’s water or air to navigate, the laws of fluid dynamics are bound to throw up wings, and bodies shaped like fish.’
Photo by Mathew Schwartz on Unsplash.

There’s hardly been a livelier time for evolutionary science than today; indeed, passions can run high. It’s not that Darwin’s vision of evolution is fundamentally in doubt: species adapt by natural selection, there’s variation between individuals, and those better adapted for their environment survive more often, passing on their genes to their children. In that, the theory of evolution stands, but many other parts of the evolutionary picture from the second half of the twentieth century are coming under criticism. That includes the following maxims:  

‘the only significant form of inheritance involves genetic code’, 

‘nothing that happens to an organism during its lifetime is passed on to its progeny’,  

‘we agree what we mean by “species”’,  

‘genes pass down the branches of the tree of life, not between them’,  

and ‘evolution is fundamentally all about competition, not cooperation’. 

Among the excellent crop of writers on these themes, Eva Jablonka and Marion Lamb stand out for their elegant prose, and a gift for communicating complex ideas clearly. As they recognise, the standard mid-twentieth century model of evolution might be worth criticising, but it’s also landed all sorts of important basic points. (They list ten.) The shortfall of the earlier, dominant theory was in being too narrow, with each insight too quickly eclipsing others.  

Here are two examples. First, the classic twentieth century picture saw inheritance in terms of DNA and genes, passed on by ‘germline’ cells, such sperm and pollen. That’s all true, but it shouldn’t restrict our wider view of inheritance to that. Today, writers such as Jablonka and Lamb stress that organisms inherit from their parents (or parent) in all sorts of ways.  

A second plank of the twentieth century picture is that evolution involves descent from a common ancestor. Again, that says something vital, even central, accepted by evolutionist old and new. The twentieth century position, however, added a restriction: that’s all that’s important on this score. The newer perspective recognises that while genes are – of course – central, and passed on from parent to child, organisms also swap genes between themselves (between branches of the tree of life, not just along those branches), even between very different species. 

If we’re not careful, what’s written and taught (not least by theologians), even with the best will in the world, will be thirty or even fifty years out of date. 

There’s a lot of excitement around these sorts of claims (and, remember, Jablonka and Lamb make eight more), and that can get quite noisy. Defenders of the older, narrower picture typically say that the newer themes are simply fuss over minor points. Advocates of the newer perspective disagree, saying that the twentieth century picture risks missing some important features of biology, which are now coming into better focus. 

Why such debates matters 

Why might this ferment among biologists matter for a site like this one, and for theologians, and discussions of religious matters? Well, for one thing, as I pointed out in my previous article, nothing quite dissolves the supposed animosity between science and religion (which is, after all, a relatively recent invention) like theologians and religious people getting excited about biology. It’s also important that any humanities scholar, the theologian among them, who’s engaging with science should keep up to date. If we’re not careful, what’s written and taught (not least by theologians), even with the best will in the world, will be thirty or even fifty years out of date. 

But there’s more at stake. As we have seen, the twentieth century picture, for all it brought an admirable clarity to evolutionary thought, was reductionistic. We see that in Jablonka and Lamb’s exhortation to scientists: ‘yes, stress x, but don’t think that means you have to deny y.’ A religious vision tends to be an expansive one. It wants to recognise the reality and value of all sorts of things. Yes, there’s matter, atoms, molecules, and genes, but there’s also organisms, agents, cultures, groups, economies, hopes, loves. They’re all real. We can’t reduce one to the other: not organisms to genes, or agents to economies. A turn from reduction is welcome. 

More than that, almost everything in the emerging twenty-first century view of evolution is fascinating from a theological perspective.  

Take convergence, for instance. It turns out that evolution isn’t just driven by randomness, or by the demands of the surroundings. Also important are various features of physics, or mathematics – the contours of reality – that throw up elegant solutions to evolutionary problems, which are adopted by evolution time and again. Wherever you need to sturdy and space-efficient packing of cells (as in a honey comb, or a a wasp’s nest), the hexagon is ready and waiting.  Wherever there’s water or air to navigate, the laws of fluid dynamics are bound to throw up wings, and bodies shaped like fish, dolphins, and penguins (which are all quite similar in shape).  

How do we know this? Because evolution has converged on wings and that body shape independently, many times, as also on eyes, and everything else that Simon Conway Morris lists in the nine closely printed columns of convergences in the index to his book Life’s Solution. Evolution certainly involves randomness and need, but alongside them is something more like Plato’s forms: timeless realities, there to be discovered and put to work. Among the more theological of these eternal verities, covered in Conway Morris’s book, are perception, intelligence, community, communication, cooperation, altruism, farming, or construction 

 Exceeding a zero-sum game 

Then there’s cooperation. Ever since Darwin’s Origin was published, and, even more, ever since Tennyson wrote about nature ‘red in tooth and claw’, theologians have been embarrassed about the place of cooperation in their vision of the world. Now, however, it turns out, competition isn’t the only force at work in biology or evolution after all. One of the features of reality that evolution discovers and puts to work again and again is cooperation, and ways to exceed a ‘zero-sum’ game. We see that in cooperation within a species, but also in cooperation between species, which is ubiquitous in nature: called mutualism, it’s found everywhere. As a rule, once two species stick around in proximity for the long run, down many generations, their relationship will turn to mutual benefit.  

Ethicists are often wary of the suggestion that we can look at the way things are, and read a moral code there (getting an ‘ought’ from an ‘is’), but it’s an unusual person whose vision of right and wrong isn’t shaped, to some degree, by a sense of what the world is like. Well, it turns out that nature bears witness to the enduring worth of cooperation, and not only to competition.   

In the first of these articles on biology, I pointed out the significance of ethics in thinking about biology, and about evolution in particular. For better or worse, and often for worse, thinking about evolution has been an ethical, social, political story. The evolutionary has been put to work for immoral, ends. It turns out to be wrong twice over to suppose evolution commends only competition. It’s wrong, first of all, because we are rational creatures, who can aspire to an understanding of good and evil that transcends the realm of nature. But also, as we now see, it’s wrong even to suppose the nature is only red in tooth and claw. There’s competition, but there’s also a lot of cooperation.  

 

Suggested further reading 

Archibald, John. 2014. One Plus One Equals One: Symbiosis and the Evolution of Complex Life. Oxford: Oxford University Press. An accessible introduction to biological mutualism, with an emphasis on the role of hybrid organisms (one living inside another) in major evolutionary transitions. 

Bronstein, Judith L., ed. 2015. Mutualism. Oxford: Oxford University Press. The new standard treatment of biological mutualism. 

Morris, Simon Conway. 2008. Life’s Solution: Inevitable Humans in a Lonely Universe. Cambridge: Cambridge University Press. A comprehensive discussion of convergence in evolution. 

Day, Troy, and Russell Bonduriansky. 2018. Extended Heredity: A New Understanding of Inheritance and Evolution. Princeton, NJ: Princeton University Press. An engaging introduction to a broadened picture of inheritance. 

Davison, Andrew. 2020a. Biological Mutualism: A Scientific Survey. Theology and Science 18 (2): 190–210. An accessible survey of some of the science of biological mutualism. 

———. 2020b. Christian Doctrine and Biological Mutualism: Some Explorations in Systematic and Philosophical Theology. Theology and Science 18 (2): 258–78. A foray into some of the significance of mutualism for Christian theology. 

Jablonka, Eva, and Marion Lamb. 2020. Inheritance Systems and the Extended Synthesis. Cambridge University Press. A short discussion of many of the more expansive aspects proposed for contemporary evolutionary thought. 

Jablonka, Eva, Marion J. Lamb, and Anna Zeligowski. 2014. Evolution in Four Dimensions: Genetic, Epigenetic, Behavioral, and Symbolic Variation in the History of Life. Revised edition. Cambridge, MA: MIT Press. One of the most substantial discussions of the new perspective. 

Laland, Kevin, Tobias Uller, arc Feldman, Kim Sterelny, Gerd B. Müller, Armin Moczek, Eva Jablonka, et al. 2014. Does Evolutionary Theory Need a Rethink? Nature 514 (7521): 161–64. MA short two-sided piece, asking whether a transformation in evolutionary thinking is under way.  

Essay
Awe and wonder
Creed
Easter
7 min read

At the tilting points of the year, we ask what kind of world we want to build

Equinox is still a threshold between darkness and light.

Elizabeth Wainwright is a writer, coach and walking guide. She's a former district councillor and has a background in international development.

Sun rise casts a shadow over Stonehenge.
Nik, via Unsplash.

At the spring equinox, we appreciate and talk about the arrival of light in the northern hemisphere. For a brief moment, the Earth’s axis is tilted neither away from or toward the sun, and day and night are roughly equal length – ‘equinox’ is Latin for ‘equal night’. From here, we enter astronomical spring.  

But it is not entirely accurate to talk about this being the moment when the darkness is finally diminished. That moment is the ‘equilux’ – equal light – and it happens a few days before the equinox, its date varying with latitude. Because the sun appears as a disc in the sky, the top half rises above the horizon before its centre does, which – when coupled with light being refracted by the Earth’s atmosphere – gives extra daylight. By the time of the equinox, and depending on your latitude, we already have 12 hours and 10 minutes of daylight. It is not much, but it is enough perhaps to read a few pages of a book without an artificial light, or to have “just one more” kick of a ball outside, as my daughter has learned to say.  

There is beauty in the idea that for a brief moment during the equinox, we are all experiencing the same light and dark. But it is not true. At any particular moment, some of us experience more darkness than others, and some of us receive more light than we think.  

Whenever its moment of arrival, though, the light will arrive. It always has, since the world was set spinning and tilting in space. We have always found ourselves poised at the threshold between the long dark of winter and the gathering light of summer. It is a threshold that is embedded in creation itself; all of life must in one way or another face the work, the inevitability, the challenge of transformation. This threshold is echoed through our own lives too – in the in-between spaces where one thing is ending, but the next has not yet fully begun. There are personal thresholds: a change in career, a birth, a loss. And there are collective ones: times in history when the old ways no longer work and we strain toward something new, unsure of how to get there.  

Ancient people marked the equinox with purpose and care, watching for the moment the sun rose in the east and set in the west. At places like Stonehenge, huge stones were arranged to capture the exact angle of equinoctial light, as if the builders knew this threshold was something worth marking. Recently, archaeologists have suggested that Stonehenge was built not just for religious reasons, but for unification too: its stones come from Cornwall and Wales and Scotland – from all parts of the land. Their slow journey to their resting site on Salisbury plain would have been a chance for celebration and feasting, with thousands of people joining in along the way. It was a journey that would have brought together different people, including groups that had migrated from modern day Europe. Gathering light was a shared effort, and one worth celebrating.  

For the early Celtic world, the equinox was a hinge between Imbolc, the season of early stirrings, and Beltane, the riot of summer. It was a time for reckoning and renewal – counting what food remained after winter, deciding what animals to keep or cull, what seeds to plant. To live well meant paying attention to the balance between what had been and what was to come. Lately, I have realised that it is not change itself that feels hard so much as not knowing the nature of the change that I, that we, will be called to. My young daughter has brought this into sharp focus. On the days when the dark feels relentless and the light seems distant, I find myself fearing for her future. I think of those Celtic people; the way they did not know the future but prepared for it anyway, perhaps in their rituals asking, how do the past and the future speak to each other at this moment, who are we, who might we become?  

Even if we long to cling to what is familiar, the familiar will eventually change. Easter, and the equinox, are not just about light triumphing over darkness, but about transformation.

In a world where crisis seems to be following crisis, it is easy to feel that everything is tipping off balance. The equinox suggests though that equilibrium has never been static, and balance has only ever been fleeting, a transition between states of being. It is a moment of poised readiness, a preparation for movement. The world will keep tilting and tipping as it always has, and we will keep changing as we always have.  

In the Jewish calendar, the equinox often falls near Passover, the great festival of liberation. The story of the Exodus is a story of transition – of leaving behind what enslaves us even when the road ahead is unknown. The Israelites did not step from captivity into freedom overnight. They wandered, and wrestled with doubt, and longed for the certainty of their old lives even as they were being offered something new. Thresholds are rarely comfortable.  

I find myself at a threshold now: I am trying to shape a life that has reformed around motherhood, with past roles and jobs behind me, and the new identities yet to fully clarify. I have been feeling the truth of farmer-author Wendell Berry’s idea that "it may be that when we no longer know what to do, we have come to our real work." This real work has been stimulating but also confronting, as thresholds often are.  

If we are, as many believe, living through a threshold moment in history – where old systems are failing, where climate and conflict threaten the future – how do we walk forward? How do we resist the temptation to cling to what is familiar, even when it no longer serves us? Easter falls just after the equinox. Shoots push through soil, lambs stumble into life, a chorus of birdsong swells, and we remember that nature is all resurrection. Even if we long to cling to what is familiar, the familiar will eventually change. Easter, and the equinox, are not just about light triumphing over darkness, but about transformation. Jesus did not return from the tomb unchanged; he was made new, unrecognisable at first, even to his closest friends.  

The balance of light and dark is fleeting; it does not last; a threshold is not a place to linger. The world is always moving towards light, or toward dark, but always through change, and so are we. Balance is not an end in itself; it is a preparation for change. Perhaps these tilting points of the year are good moments to ask who we are becoming, and what kind of world we want to build, and how we will bear witness to the light, but also to the dark, as we do so.  

This equinox, then, we will turn and face the coming light, but perhaps too we might turn and notice the faces that the light shines on – or doesn’t. Virginia Woolf reminds us that "A light here required a shadow there." When the light comes, darkness will too. These turning points of the year are an opportunity to sit in the truth of that, to appreciate the hope and the beauty of this spring threshold, but also to get to work. We can reach out to those who are experiencing more darkness than us, help build the world in such a way that draws attention to the light like the makers of Stonehenge did, take stock of what has been and who we are becoming, step away from what enslaves us even if we are not yet sure of the shape of freedom.  

We cannot know what will happen next, but we can choose how to move forward. I wonder about those ancient people who somehow moved huge stones weighing up to 30 tons to Stonehenge; I wonder what they saw as they moved through the land, when they looked to the horizon, when they stood in the tension of their own now. They carried not just the weight of stone, but of their own unknowable future. Those ancient people persisted and celebrated and became us, passing on their burden, passing on their particular stone-bound, collectively built way of focusing the light. This equinox, I am thinking about how I can do the same – despite and because of the darkness, despite and because of the unknown path ahead. 

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