habitable worlds

Hello, I am wondering what are the conditions/parameters for earth like planets. Originally I would have thought just being terrestrial but as I use the program I am seeing this is not the case, example one terrestrial world has no atmosphere. I mean is there a table with Earth's stats that if I came across a new planet I could say this in habitable or hospitable by Earth standards by comparison Example in Star Trek what are the conditions for designating a class M planet as Class M - thanks

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