Do you know the difference between a living thing and a nonliving thing? You are a living thing. And so are puppies, trees, and mushrooms. Bicycles, rocks, shoes, and tennis balls are nonliving things.
How do you tell living things from nonliving things? All living things have certain features in common. Almost all living things must have food, water, and air. And they are made up of tiny units called cells. Living things also reproduce, which means they can make new living things just like themselves.
The many, many types of living things are also different from one another in important ways. Scientists separate all living things into large groups called kingdoms. Each kingdom is made up of living things that are similar to one another. Each kingdom is different from the other kingdoms.
Most scientists say there are five main kingdoms. Animals make up one of the kingdoms. Most animals move around and get their food by eating other living things. Plants make up another kingdom. The plant kingdom is important to the other kingdoms because plants create the food that most other living things need. The other kingdoms include organisms such as fungi and algae.
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