![]() ![]() ![]() But when a human egg splits-first into 2, then 4, then 8, 16, 32, 64, and so on-it embarks on a venture that will, over the next nine months, produce descendant cells with a huge variety of shapes and functions: bone cells, nerve cells, red and white blood cells the cells of the eyes, fingernails, stomach, and skin.Ĭonsider, for example, your body’s crowning glory, your head. When an amoeba divides, all you get is more amoebas. The egg, after all, boasts dazzling prospects, a future of truly dizzying-and until very recently, utterly baffling-complexity. Yet that humble and nondescript appearance is highly deceptive. In fact, the average one-celled amoeba looks far perkier under a microscope than a fertilized human egg. ![]() We all begin existence as the simplest thing you can imagine if you’re trying to picture life: a single cell-nothing, in other words, but a tiny, spherical bag of proteins. ![]()
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