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Injuries by insects is / are :

[A].	An essential part of the forest ecosystem	[B].	Some are beneficial; quite a few are serious pests of trees and wood products
[C].	Tonica inviferana, a semal shoot borer, Ascotis imparata,	[D].	A bakain defoliator and Margaronia phloalis a defoliator of mulberry are serious pests of other tree species grown in forest plantations
[E].	All of the above

Answer: Option E