Here's why:

* Natural Resources: These are materials or substances that occur in nature and can be used for economic gain. They are not created by humans and are essential for human survival and development.

Let's break down each resource:

* Plants: Provide food, fiber, medicine, building materials, and oxygen.

* Animals: Provide food, clothing, transportation, and companionship.

* Water: Essential for drinking, agriculture, industry, and transportation.

* Air: Necessary for breathing and supporting life.

It's important to remember that natural resources are not infinite and need to be managed sustainably to ensure their availability for future generations.