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These processes take a Kate Kelly Out Of Patience For Deeply Disappointing Men In Unmerited Positions Of Authority Shirt years or so and once the Earth becomes potentially capable of supporting life, we actually see the earliest signs of life during that period. It could have just as easily taken another billion years to hit upon the first self-replicating molecule. We don’t know the exact details of how life got started but we do actually know lot about the kinds of processes it would have required. The key event would have been the first self-replicating molecule – which probably was not life as we know it, but an RNA precursor. The next key event would have been the conversion from RNA to DNA-based life. Forming the right kinds of molecules in the right concentrations at the right Ph levels isn’t something a new world is likely to hit upon immediately, and indeed, it seems like it took at least a few hundred million years before we see the first artifacts of life on Earth.
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The key to understanding the Kate Kelly Out Of Patience For Deeply Disappointing Men In Unmerited Positions Of Authority Shirt of abundant sea life has to do with the winds as well. In most of the ocean, biologically available nitrogen and phosphorus come from relatively deep in the ocean, where biological production is low, and thus these nutrients are not exhausted. The two main mechanisms by which N and P become available in the upper photic (sunlit) zone are strong mixing, due to a strong winter storm or tropical cyclone, and upwelling along the coasts or driven by wind convergence near the equator. The important thing here is that, with little to no wind over a large area of ocean, the nutrient levels are extremely low. Low nutrient levels have the obvious consequence of inhibiting phytoplankton growth, often referred to as primary production, as it involves direct photosynthesis and is how most chemical energy is made available to ocean life. Areas of extremely low primary productivity can be seen in the following satellite image of ocean color.