The human species have a brain to develop ideas from different judgement site of it. From this life-environmental point of view, one group of scientists are thinking of life in Mars. I also share with it, with something more that this earth may be an another Mars one day as per the very mode of development of 'Civilization' made by human and that is unavoidable.
It is also extra-imaginal views that in this unlimited universe, there may more planets of lives, but in different forms and structures. This DNA may not be there, instate alternatives.