all that’s happened is that a round plate has become a triple-decker cell sandwich. But you’re already infinitely more interesting than the raspberry you were a short while ago. These cells are no longer confused, needy newcomers with no idea where they are or what they’re supposed to do. They have completed a rough division of labour. The cells on the top layer will form, among other things, skin, hair, nails, eye lenses, nerves and your brain. From the bottom layer you’ll get intestines, liver, trachea and lungs. And the middle layer will become your bones, muscles, heart and blood vessels.
As time moves on, each cell will become more and more specialised. Eventually, you will end up with over 200 different types. Their shape, size and characteristics will vary enormously. Round red blood cells will float around your body, carrying oxygen. Immune cells will patrol for intruders. Your ear will contain hairy sensory cells that dance to every sound you hear, and electrical signals will flicker and spark in your brain through the long threads of nerve cells.
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