How closely do you think a planetary environment would have to resemble that of our Earth in order for life to exist there?

How closely do you think a planetary environment would have to resemble that of our Earth in order for life to exist there?
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answer:I never understand why we seek out only earthlike planets to look for life. Who says alien life has to look anything at all like earth life? Life on other planets would go through completely different evolutionary processes and would presumably look completely different from what we’re used to, but it is entirely possible it could adapt to environments we consider inhospitable.
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