Given that command, you are probably picturing that famous drawing found in science textbooks years ago.
It illustrates a sea creature coming ashore, followed by tiny mammals, followed by a monkey walking on all fours. The monkey develops into an ape that develops into a hairy little caveman whose knuckles touch the ground. Progressively taller and less hirsute cavemen appear, improve their posture, and voila the animal closest to the inland looks just like modern man.
According to science, such a transformation took place over millions of years....