Gravity..is the key to it all...if there was no gravity...and we grew up in a planet of no gravity we probly be shorter then how we are in gravity...
in some way gravity allows our body to produce oxygen and carbon dixoid and with those we survie when we breath in and out we are taking in Oyxgen and when we exhale we are releasing the carbon...and if our bodies didnt release the carbon...we probly wouldnt surive...long..
and earth is probly the only planet so far that is known to allow our species...and no one knows if there is another planet somewhere that has our species and if there is ...there is no answer to how to get there safely
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