The homological structure, embryological development, and rudimentary organs of a species, whether it be man or any other animal, to which our attention may be directed, remain to be considered; but these great classes of facts afford, as it appears to me, ample and conclusive evidence in favour of the principle of gradual evolution.
"The Descent of Man and Selection in Relation to Sex, Vol. I (1st edition)"
Charles Darwin
We have seen in the first chapter that the homological structure of man, his embryological development and the rudiments which he still retains, all declare in the plainest manner that he is descended from some lower form.
"The Descent of Man and Selection in Relation to Sex, Vol. I (1st edition)"
Charles Darwin