" Consciousness surely did not, James said, suddenly irrupt into the universe fully formed. The history of life is a history of intermediates, shadings-off, and gray areas. Much about the mind lends itself to a treatment in those terms. Perception, action, memory—all those things creep into existence from precursors and partial cases. Suppose someone asks: Do bacteria really perceive their environment? Do bees really remember what has happened? These are not questions that have good yes-or-no answers. There’s a smooth transition from minimal kinds of sensitivity to the world to more elaborate kinds, and no reason to think in terms of sharp divides. "

― Peter Godfrey-Smith , Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness