Changes In Ecosystems
When the average weather conditions in a particular area or part of the world change and the change lasts for a long period of time, it is considered a climate change. An environmental change is a change that takes place in the environment due to natural disasters, human interference, or animal interactions. A change over time in an ecosystem in which life is added to an area or life is destroyed in an area is called succession.
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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.