Confronting Science Contrarians: Appreciating Evolution
Who Says Understanding Earth’s Evolution is Irrelevant?
Sadly all too many.
I often hear people, not just the religious with their thoughtless rejection and outright contempt for our Earth and her story, but also rational educated people who superficially accept the notion of evolution, yet who seem to have little curiosity about Earth’s Pageant of Evolution, voice complete disinterest.
Too many dismiss the need to learn anything about it as though Evolution were pointless. All the while I’m thinking, but evolution created this world we depend on, why isn’t that worth embracing?
The general apathy doesn’t seem right. Especially considering what an amazingly beautiful, action packed, complex, mysterious and absolutely relevant story Earth’s deep history has to offer us.
From it’s earliest formation with that improbable, but oh so perfectly aimed collision that ‘liquified’ the planet, then reformed that mess into our amazingly advantageous coupled Earth and Moon arrangement, without which complex animals probably could never have evolved on Earth.
On a microscopic level it started with the changing brew of elements and molecules that kept on playing with each other, always trying to find advantageous pairings. Those select advantageous pairings lead to cascading sequences. Thanks to time, lots of time, some of those pairings started repeating themselves in new ways.
Evolution is the passage of generations within their constantly changing environment. To survive one must learn, adapt, change, and be fruitful. It wasn’t always the fittest, sharing and cooperating turns out to have a great deal to do with survival. As does plain old luck, being in the right place at the right time, rather than the wrong one on a bad day.
So it began with elemental atoms getting concentrated here on Earth, then combining into ever more complex and interesting molecular bundles. Some of these combinations of molecules evolved and diverged into ever richer assortments of minerals. Then life joined the party bringing along a few tricks.
Life figured out how to ingest some of those newly evolving minerals and rearrange them into yet more unique minerals that could then be used for building body parts.
Life also somehow figured out how to split water molecules into their individual atom’s thus starting the rise of free oxygen. A very rare thing because oxygen is one of the most reactive atoms around. Meaning mineral evolution was supercharged once oxygen atoms were available to bind with elements and minerals.
Life kept on making more oxygen, with time oxygen ran out of minerals and elements such as iron to bind with, it then started to accumulate in the atmosphere.
That led to some real losers, still only oxygen had the “reducing” properties with the potential to power the complex organisms requiring intensive metabolic activity. Meaning the losers were quite simple organisms, while the stage was being prepared for something much grander.
Life, that is biology, kept busy getting along and figuring out how to do the things it did better, since that’s what got passed down in greater quantity. During Earth’s first two, three billion years life was constrained by the limitations of Earth’s toxic environment.
Scientists have learned that in order to understand a cell, they needed to understand its environment as much as the cell’s interior. This appreciation goes a long way to explaining why life remained at the simplest level for so long. Earth’s toxic environment.
It should be no surprise there was little to see on the outside, cells were responding to a hostile environment, still generations were living out their lives and experimentation was going on at the fine detail level.
Life was busy discovering biological tricks, engineering the molecular components that would, over the course of billions of years, learn to fit together with other components, eventually enabling complex life to blossom.
But, Biology couldn’t have done it without her partner Geology! Earth’s geology includes our moon which probably played a vital role in kick starting plate tectonics, which kick started continent formation.
Tectonics became evolution’s forge. You know, with all that bulldozing, mixing, and pressing, and baking, and volcanic activity, and so on.
We’ve also learned that the moon started orbiting rather close in to Earth and in the beginning the days were as short as 5 hours. Try to imagine those first billion years with truly humongous relentless tidal waves racing fast as jets, mowing down early volcanoes as they emerged from the oceans.
Of course as the moon pulled away from Earth, the days became incrementally longer while the tides became shorter. Our moon continues pulling away from Earth, though now it’s slowed down to about an inch and half a year.
The volcanoes were equally relentless, continental shelves and mountains slowly built up upon huge tectonic plates that floated atop Earth’s softer mantel. They were jostled around our globe driven by deep down convection currents. Which destined them to smash into each other and create yet more volcanoes and land formations, and gases for our atmosphere and so on.
Try to imagine those first nearly four billion years, there were no plants, no roots, no soil, only wind, rain, rivers, and the pounding waves - erosion, rocks, sand, and the ocean and those relentless waves.
Then some six, seven hundred million years ago, among with geochemical changes, Earth’s rotational wobble aligned with continental movements and ocean currents to produce a couple glacial periods that covered the continents, turning our planet into a Snowball Earth. Periods when glaciers pulverizing massive quantities of rocks on the continents (as in a mile’s worth and more) . This then flowed into the seas enriching them with mineral nutrients and more building blocks for life. Over the oceans ice reached all the way to the equator.
Then some really wild things started happening. For one, the simple single celled life, that had any sense, kept moving towards the open water and sunlight. See what’s going on here? Though glaciers covered the oceans, it was never 100% covered. There were always currents that came together, cracks and leads and narrow water channels where sunlight still accessed ocean waters.
These single-celled critters of every variety were increasingly concentrated, meaning competition and opportunities for those who learned fastest and adapted bestest.
All the while, deep in the belly of Earth the kilometer and more worth of glaciers was acting as insulation holding in the heat that was rising up from the core. The weight of the ice also acted as a pressure lid. Meaning volcanic activity was stifled, while heat from Earth’s deep interior was accumulating and volcanic pressures were increasing.
{last edited August 2, 2019}
bless your 
