What has always struck me as funny is that all the time we read, “This planet could have the ingredients to support life.......as we know it.”
Who is to say that life on any other planet may breathe argon, helium, nitrogen, or some other unkown gas??? They may be very comfortable in 400 degree temperatures...or -500 degree temps...They may eat rocks and crap dirt...
It is ridiculous to only relate OUR requirements for life to anywhere else....Unless we are looking for another place for us to go...
The problem for life to arise is self-replication. That could put some restrictions on the chemical basis.