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
Remember :
The smallest number is the one that comes first while counting.
Solution :
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21,27,23
21 is the smallest number.