The genetic variation in any species is confined to a limited set of variables such as a finch beak’s thickness.
Species are surrounded by other species (often sharing the same body), and therefore may interfere with one another’s fitness.
As I stood by the lab doorway, Lewontin — who was sitting right down front — looked back towards the door and caught my eye.
We rarely give a second thought to our body’s energy production. Robots use a battery pack and long lengths of wiring to transfer electricity.
Paleontologist George Gaylord Simpson once declared that “man is the result of a purposeless and natural process that did not have him in mind.”