Normal and malignant cells know how to build. Each carries its own agenda that tells it when it should grow and divide and how it should aggregate with other cells to create organs and tissues. Our bodies are nothing more than highly complex societies of rather autonomous cells, each retaining many of the attributes of a fully independent organism.
-Robert Weinberg, One Renegade Cell (Basic Books, 1998)
I’m sure that’ll piss off holistic apologists and theists, but literally speaking, it’s true.