A natural resource is anything that comes from nature that people or animals use in order to survive. People get the food they need from forests and bodies of water. These are both natural resources. Water is a natural resource that living beings need. Without water, living beings would not survive. Natural resources are things that come from Earth. People save resources when they conserve them. When you conserve something, you use less of it at one time. People reuse things when they find a new or different way to use an old item. People reduce what they use by using less of it. Recycling is taking something that has been used and turning it into something new.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.