A (Very) Short History of Life on Earth: 4.6 Billion Years in 12 Pithy Chapters

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A (Very) Short History of Life on Earth: 4.6 Billion Years in 12 Pithy Chapters

A (Very) Short History of Life on Earth: 4.6 Billion Years in 12 Pithy Chapters

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Life teems through Henry Gee’s lyrical prose – colossal supercontinents drift, collide, and coalesce, fashioning the face of the planet as we know it today. Creatures are engagingly personified, from ‘gregarious’ bacteria populating the seas to duelling dinosaurs in the Triassic period to magnificent mammals with the future in their (newly evolved) grasp. Those long extinct, almost alien early life forms are resurrected in evocative detail. Life’s evolutionary steps – from the development of a digestive system to the awe of creatures taking to the skies in flight – are conveyed with an alluring, up-close intimacy. About the author The way the book is formatted you move forward through time with the Earth as it starts out in the earliest and then move forward. Each chapter is nicely grouped and none stand out as being overwhelming or unnecessary. I loved that as he moved through the evolution Henry Gee didn’t just focus on the animal life, he looked at the plant life as well. There were interesting facts I didn’t know and none of the science was too technical. There was always an explanation to help the layman to understand subjects they might not have encountered. The Earth’s heat, radiating outward from the molten core, keeps the planet forever on the boil, just like a pan of water simmering on a stove. Heat rising to the surface softens the overlying layers, breaking up the less dense but more solid crust into pieces and, forcing them apart, creates new oceans between. These pieces, the tectonic plates, are forever in motion. They bump against, slide past, or burrow beneath one another. This movement carves deep trenches in the ocean floor and raises mountains high above it. It causes earthquakes and volcanic eruptions. It builds new land. With dramatic flair, Henry Gee’s sweeping new book, A (Very) Short History of Life on Earth, tells the 4-billion-year story of life on this planet and how it has been repeatedly shaped by geological, climatic, and atmospheric forces. Trained as a paleontologist, Gee tells life’s history using the framework of the fossil record, offering insights from the related fields of ecology and physiology. Interwoven as it is with geology and climate, life evolves the way Ernest Hemingway said we go broke: “gradually and then suddenly” (1). Some even experimented with multicellular life, such as the 1,200-million-year-old seaweed Bangiomorpha26 and the approximately 900-million-year-old fungus Ourasphaira.27 But there were stranger things. The earliest known signs of multicellular life are 2,100 million years old. Some of these creatures are as large as twelve centimeters across, so hardly microscopic, but they are so strange in form to our modern eyes that their relationship with algae, fungi, or other organisms is obscure.28 They could have been some form of colonial bacteria, but we cannot discount the possibility that there once lived entire categories of living organisms—bacterial, eukaryote, or something entirely other—that died out without leaving any descendants and that we should therefore find hard to comprehend.

Some hundreds of million years from now, Earth will become uninhabitable to even the hardiest organ isms, spelling the final doom for Earth-evolved life—unless, perhaps, some earthlings manage to escape into space first. Meanwhile, the reader is rewarded with a deeper appreciation of our own place in the grand scheme of life, where even the best-adapted species disappear within a time that is minute on the scale of evolution. Alternately admiring and critical, unvarnished, and a closely detailed account of a troubled innovator. Every time majority of flora and fauna gets wiped out (Five mass extinctions), life always reappeared and took a different direction in the evolutionary path. The story is the same with early life forms, or dinosaurs or proto mammals. The chapter about evolution of hominids is pretty interesting and made me realize how the human history is not even a chapter but a mere footnote in the grand book of life on earth. Bringing us to the third section that I have divided this book into, we see the rise of mammals, and other small creatures after the remnants of the dinosaurs’ ashes covered the Earth. And yet, as is the key idea that I believe this book is trying to convey, is Life found a way. Despite all of the challenges that it had faced up until that point, Life was able to continue, and find new ways to grow to extremes and diversify in ways it had never done before. Towards the end of the book, we finally come to where we come in, and what a small section there is about us. This is appropriate, for, in the grand scheme of geologic time, we have, to take a word from the title, left a pithy mark on this planet. From there, we go into the future, discussing how Humanity’s population will finally begin to drop in 2100, and how after a few tens of thousands of years after that, we will be extinct, like so many other organisms that have gone before us. Unlike carbon dioxide, oxygen might be thought of as an all-round good thing, essential to life on Earth. And yet it was a sudden surge of free oxygen that caused the Great Oxidation Event, unleashing the first of many mass extinctions that pepper the history of this planet. All that oxygen scrubbed the air of the carbon dioxide and methane that were keeping Earth warm and launched the first and longest ice age, 300 million years during which the planet became ‘Snowball Earth’, covered from pole to pole with ice. ‘And yet,’ observes Gee calmly, ‘the Great Oxidation Event and subsequent “Snowball Earth” episode were the kinds of apocalyptic disasters in which life on Earth has always thrived.’If you have already watched David Attenborough’s Life/Origin of life or Neil deGrasse’s Cosmos docuseries like me, then this book will act as a fantastic recap of the complex history of life on earth. If you haven’t watched the above-mentioned docuseries, then this book will be an absolute delight for anybody interested in natural history. Also, I highly recommend watching these awesome docuseries in the soothing voice of Mr. Attenborough and Mr. Tyson. Henry Gee makes the kaleidoscopically changing canvas of life understandable and exciting. Who will enjoy reading this book? - Everybody!' Jared Diamond, author of Guns, Germs, and Steel

Henry Gee’s whistle-stop account of the story of life (and death — lots of death) on Earth is both fun and informative. Even better, it goes beyond the natural human inclination to see ourselves as special and puts us in our proper place in the cosmic scheme of things." In plants today, the energy-harvesting pigment is called chlorophyll. Solar energy is used to split water into its constituent hydrogen and oxygen, releasing more energy to drive further chemical reactions. In the earliest days of the Earth, however, the raw materials were just as likely to have been minerals containing iron or sulfur. The best, however, was and remains the most abundant—water. But there was a catch. The photosynthesis of water produces as a waste product a colorless, odorless gas that burns anything it touches. This gas is one of the deadliest substances in the universe. Its name? Free oxygen, or O2. To the earliest life, which had evolved in an ocean and beneath an atmosphere essentially without free oxygen, it spelled environmental catastrophe. To set the matter into perspective, however, when cyanobacteria were making their first essays into oxygenic photosynthesis—3 billion years ago or more—there was rarely enough free oxygen at any time to count as more than a minor trace pollutant. But oxygen is so potent a force that even a trace spelled disaster to life that had evolved in its absence. These whiffs of oxygen caused the first of many mass extinctions in the Earth’s history, as generation upon generation of living things were burned alive. Dr Henry Gee presents creatures from ‘gregarious’ bacteria populating the seas to duelling dinosaurs in the Triassic period, to magnificent mammals with the future in their grasp. Life’s evolutionary steps – from the development of a digestive system to the awe of creatures taking to the skies in flight – are conveyed with an up-close intimacy.From that first foray to the spread of early hominids who later became Homo sapiens, life has persisted, undaunted. A (Very) Short History of Life: 4.6 Billion Years in 12 Chapters is an enlightening story of survival, of persistence, illuminating the delicate balance within which life has always existed, and continues to exist today. It is our planet like you’ve never seen it before. definitely feels rushed at several chapters (especially chapter 3, 4), with a lot of facts that fit well into the bigger picture, but many of those facts are well forgotten. Another masterful aspect of the structure is the way that the first eight chapters build in a kind of crescendo, then the whole thing widens out with first the development of apes, then hominins, then humans and finally looks forward to the future. I use a musical term intentionally - this feels like a well-crafted piece of music, pushing us on to the big finish. Free oxygen became more abundant during the Great Oxidation Event, a turbulent period between about 2.4 and 2.1 billion years ago, when, for reasons still unclear, the concentration of oxygen in the atmosphere at first rose sharply—to greater than today’s value of 21 percent—before settling down to a little below 2 percent. Although still unbreathably tiny by modern standards, this had an immense effect on the ecosystem.12

It was the tendency of bacteria to form communities of different species that led to the next great evolutionary innovation. Bacteria took group living to the next level—the nucleated cell.

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Life emerged on Earth not long after the planet’s aggregation, writes Gee, and faced its first major challenge about 2.4 billion years ago. Until this point, bacteria and archaea had been confined to the oceans, where they evaded the Sun’s deadly rays, which were not yet tempered by a protective atmosphere. Bacteria eventually learned to harness sunlight to produce energy, with oxygen as a by-product; but as oxygen levels rose, generations of bacteria and archaea that had evolved in its absence were burned alive. About 2.5 million years ago, Homo erectus arose, a territorial savannah predator, deadly thanks to two traits: it was a powerful long-distance runner and a social animal. From this lineage, Homo sapiens evolved. Humanity’s first attempt at worldwide dispersal failed, shattered by the cold of an ice age 200,000 years ago. Confined to an oasis in what is now the Kalahari Desert, humankind nearly went extinct. We, as a species, are just as fragile as all the others, reminds Gee. in chapter 3 for example, author uses a tons of extinct species to tell facts of evolutionary history, it becomes difficult to imagine them in a sentence of information, most of them you might have never heard of them. so it made sense to constantly look at Google images to see what he was telling about. majority of facts won't even stay in your head as a lot of these species won't live more than a sentence or two Eukaryotes emerged, quietly and modestly, between around 1,850 and 850 million years ago.22 They started to diversify around 1,200 million years ago into forms recognizable as early single-celled relatives of algae and fungi and into unicellular protists, or what we used to call protozoa.23 For the first time, they ventured away from the sea and colonized freshwater ponds and streams inland.24 Crusts of algae, fungi, and lichens25 began to adorn seashores once bare of life.

The first rumbles of an oncoming storm came from the rifting and breakup of a supercontinent, Rodinia. This included every significant landmass at the time.29 One consequence of the breakup was a series of ice ages that covered the entire globe, the like of which had not been seen since the Great Oxidation Event. But life responded once again by rising to the challenge.Dinosaurs, meanwhile, are animals that every child has heard of. These hugely successful creatures filled every evolutionary niche, leaving little room for much else, including the early mammals; it wasn’t until the dinosaurs died out that mammals could ‘burst forth like a well-aged champagne, shaken beforehand, and inexpertly corked’. A profusion of fast-evolving and diversifying mammals took over from the dinosaurs. They included what Gee calls ‘a group of leftovers … an assortment of scrappers that included rats, mice, rabbits, and, seemingly almost as an afterthought, the primates’. These small, swift creatures with forward-facing eyes, inclined to curiosity and exploration, would eventually give rise to Homo sapiens. But the emergence of modern humans could so easily not have happened. Around 200,000 years ago, the last survivors of the species were confined to an oasis on the edge of what is now the Kalahari desert. Yet Homo sapiens squeaked through, saved by a period of warming that turned much of the surface of the planet into rich grassland, teeming with game. Don’t miss this delightful, concise, sweeping masterpiece! Gee brilliantly condenses the entire, improbable, astonishing history of life on earth—all 5 billion years—into a charming, zippy and scientifically accurate yarn. I honestly couldn’t put this book down, and you won’t either." A]n exuberant romp through evolution, like a modern-day Willy Wonka of genetic space. Gee’s grand tour enthusiastically details the narrative underlying life’s erratic and often whimsical exploration of biological form and function.” —Adrian Woolfson, The Washington Post Daniel E. Lieberman, Edwin M. Lerner II professor of Biological Sciences, Harvard University and author of Exercised The evolution of the nucleus allowed for a more organized system of reproduction. Bacterial cells generally reproduce by dividing in half to create two identical copies of the parent cell. Variation from the addition of extra genetic material is piecemeal and haphazard.



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