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Earth isn't a special snowflake (in my opinion) and did not set the rules for developing lifeforms.
It would be unfair to say intelligent life was not here before the humans.
1514MR0077060010204628E01_DXXX.jpg (JPEG Image, 1344 × 1200 pixels) - Scaled (79%):
originally posted by: Spacespider
a reply to: TrueBrit
Many mineral formations with geometric in appearance..
Well it do not exclude our cities here on earth as mineral formations, does it..
Why should it on Mars
If that is your entry point to everything new discovered.. Nothing would ever get a second look, because by your standards if nature can produced similar patterns.. its nothing.