The oxygen content of the air, in fact the whole make-up of the air, was so close to Earth quality there were no breathing adaptations necessary.
"Eight Keys to Eden"
Mark Irvin Clifton
Yet this rather formidable term represents no more than the belief that the infinite adaptations of means to results observed in Nature are the effect of purpose, not of chance.
"The Old Riddle and the Newest Answer"
John Gerard
And if we eliminate purpose, what is there left to furnish an explanation, beyond the indubitable fact that such adaptations have always been found in organic nature, and that we have learnt confidently to anticipate that they will appear generation after generation according to the "law of heredity"?
"The Old Riddle and the Newest Answer"
John Gerard