True, but it increases the list of planets in the universe which could host life by a few hundreds of trillions. . True, but any of those conditions are deadly to humans. Just as surface life is deadly to ocean adapted life. To each they are "deadly" alien environments. I agree this is all a result of evolution based on a gradual change in DNA coding, but that is the strength of an planet like earth being able to perform a conservative estimate of two trillion, quadrillion, quadrillion, quadrillion chemical reactions over a time span of about 4 billion years. But IMO, all this increases the list of possible life forms that would be able to adapt to hostile planetary environments. One thing is clear from the Hazen clip, bio-chemicals are easy to make and on earth alone life seems to exist everywhere, including deep in the earth's mantle. The bottle-neck is found in the need for certain conditions being necessary for the self-assembly of self replicating biochemical strings. But if you start counting chemical reactions and time spans in universal terms, it seems that the probability for the development of other life forms somewhere in this vast universe is not only high, but may well be an imperative. It all starts with chemicals and there is an overwhelming abundance of chemicals in the universe and they have existed for probably some ten billion years. Given those conditions, even a monkey could come up with a Shakespearean poem, by randomly typing letters on a computer.