“If you know how to look, our body becomes a time capsule that, when opened, tells of critical moments in the history of our planet and of a distant past in ancient oceans, streams, and forests.
Changes in the ancient atmosphere are reflected in the molecules that allow our cells to cooperate to make bodies. The environment of ancient streams shaped the basic anatomy of our limbs. Our color vision and sense of smell has been molded by life in ancient forests and plains. And the list goes on.
This history is our inheritance, one that affects our lives today and will do so in the future.” - Neil Shubin
(From his brilliant book “Your Inner Fish: A Journey into the 3.5-Billion-Year History of the Human Body
” which I’d surely recommend if you haven’t read it already)