How are babies made in the womb? From a sperm cell and an egg cell, an embryo is formed, which then becomes a fetus, and ultimately a baby. Different cell types for bones, skin, muscles, blood, and brain are just a small part of the complexity of human life. Unimaginable numbers of proteins, nucleic acids, and lipids (fats) of just the right kinds are also precisely located in exactly the right locations. Without knowing any of these scientific details, the psalmist wrote, “Thank you for making me so wonderfully complex! Your workmanship is marvelous—how well I know it. You watched me as I was being formed in utter seclusion, as I was woven together in the dark of the womb” (Psalm 139:14-15, New Living Translation). In a certain sense, God makes each baby; in another sense, the baby makes itself—with help from the mother and father, of course!
Even single-celled organisms are remarkably complex, as are the molecules inside them. One example of these biomolecules are the proteins. Proteins are very important because they orchestrate much of the chemistry in living cells.