A. It is an ideal against which an actual forest may be compared
B. Normal increment “the increment laid on by a normal forest”
C. Normal age class distribution “A complete series of age classes in such proportions as will permit equally yields by volume from annual or periodic felling under given rotation and silvicultural system
D. All of the above
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The correct answer to the question: "What are the essential components of normal forest?" is "All of the above".