Quote:
Originally Posted by blankall
If life were to happen it probably wouldn't survive very long, as the existing life would take it out. For example, you wouldn't have a large stew of amino acids and carbohydrates without existing life consuming it.
In order for life to involve a second time, it would have to happen in a sterile environment that is also conducive to life evolving.
There also is some ongoing research to show that life may have evolved more than once on Earth. Most life is microbial, and we have a very poor knowledge of that life. We haven't sampled and then molecularly examined every microbe from every nook and cranny. In fact, we've likely only examined a very small fraction and largely from the most common of places.
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Let alone that 75% of this planet is water, and we can't even find something as large as a jet liner that falls into it. So much of earth is unexplored, let alone the life that exists there.