“ The uniformity of the earth's life, more astonishing than its diversity, is accountable by the high probability that we derived, originally, from some single cell, fertilized in a bolt of lightning as… Lewis Thomas
“ All of today's DNA, strung through all the cells of the earth, is simply an extension and elaboration of [the] first molecule. Lewis Thomas
“ An irrefutable proof that such single-celled primaeval animals really existed as the direct ancestors of Man, is furnished according to the fundamental law of biogeny by the fact that the human egg is… Ernst Haeckel
“ If a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the cour… Herbert Spencer
