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All living things have one thing in common—they’re made from cells.
Cells are often described as “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, reproduces, and even dies.
Every cell also carries a complete set of instructions. In a plant cell, it determines 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 an organism turns into a plant, a tiger, or a human. In other words, cells contain the master code that makes all living things what they are.
