![]() The problem with understanding the origin of life is that we don’t know what the first life was like. As well as explaining how life began, this “everything-first” idea of life’s origins also has implications for where it got started – and the most likely locations for extraterrestrial life, too. What’s more, they easily combine to make startlingly lifelike “protocells”. It turns out that all the key molecules of life can form from the same simple carbon-based chemistry. Yet perhaps astoundingly, two lines of evidence are converging to suggest that this is exactly what happened. The alternative – that life emerged fully formed – seems even more unlikely. It is, some researchers are starting to realise, like trying to build a car by making a chassis and hoping wheels and an engine will spontaneously appear. When put into practice in the lab, however, these ideas don’t produce anything particularly lifelike. Most are based on the assumption that cells are too complex to have formed all at once, so life must have started with just one component that survived and somehow created the others around it. Many ideas have been proposed to explain how life began. What happened on our young planet? How did its barren rocks, sands and chemicals give rise to life? The Sims 3 Supernatural Free Download Lifeless Planet Free Download Need For Speed The Run Free Download Assassin's Creed 2 Free Download Need for Speed: Rivals Free Download Metro 2033 Free Download SimCity 2014 (Single Player) Free Download The Settlers 7 Paths to a Kingdom Gold Edition Free Download Sims 3 Expansion Packs Full List. Yet, every other planet in the solar system seems lifeless. Today, life covers every centimetre of the planet, from the highest mountains to the deepest sea. ![]() Within a billion years, it had become inhabited by microorganisms. WHEN Earth formed 4.5 billion years ago, it was a sterile ball of rock, slammed by meteorites and carpeted with erupting volcanoes.
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