An ecosystem consists of all of the living things (like animals and plants) in their nonliving environment (climate, weather, sun, soil, etc.). An ecosystem can be very large or very small. It can be as large as an entire rainforest or as small as the area underneath a rock. A niche describes the role that an organism fills within its environment.
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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.