Graph 2-9 
-Refer to Graph 2-9.In the graph, the curves shown are:
Definitions:
Environment
The sum of all external conditions affecting the life, development, and survival of an organism.
Discontinuous Change
An aspect of development that is characterized by abrupt or stage-like change.
Sudden Surge
An abrupt and substantial increase or intensification of something, such as energy, activity, or emotion, occurring in a short period of time.
Proficient
Having a high degree of skill or expertise in a particular field or activity.
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