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All living things have one thing in common: They’re made from cells.
Cells are often called “building blocks.” For instance, you are made of many trillions of cells. Yet cells are not just tiny bricks. Like you, each one gathers fuel, creates energy, grows, and reproduces. It even dies.
Every cell also carries a full set of instructions. In a plant cell, it prescribes things like leaf size. In a tiger, it tells each cell in a stripe what color to be. In a human cell, it gives us features like height and eye color. It also decides whether a being turns into a plant, a tiger, or a human. In short, cells contain the master code that makes all living things what they are.
