Carl Sagan said this quote
“ It is very difficult to evolve by altering the deep fabric of life, any change there is likely to be lethal. But fundamental change can be accomplished by the addition of new systems on top of old ones. ”
“ It is very difficult to evolve by altering the deep fabric of life, any change there is likely to be lethal. But fundamental change can be accomplished by the addition of new systems on top of old ones. ”