"Why has life preferred D-amino acids instead of L-amino acids for protein formations?"
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What other possible alternative environments are there in which life may have originated?
No one really knows the environment in which life originated, since there is little if any geological record from the time life began. The most probable environment is probably the classical warm shallow sea that is rich in organic raw material (the "primordial soup"). But other environments that are being considered include the deep subsurface, or hydrothermal vents, or water under a frozen layer of ice, or tidal pools, or shores with breaking waves. I am sorry I can't be more specific, but that is our present state of ignorance about the origin of life.
David Morrison
NAI Senior Scientist
June 10, 2004
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