Every human began as one cell
All the cells in an animal body develop from a single totipotent zygote. From that one starting point, development produces specialized tissues and organs.Cells: How One Cell Becomes a Human Body
One cell becomes hundreds of kinds
There are an estimated 200 different cell types in the human body. Cells become different because they receive signals from their surroundings and change as they divide.Cells: How One Cell Becomes a Human Body
