Answer :
The correct option is that:
C A forest is an open system in terms of energy.
D.A forest is an open system.
What is a forest?
It should be noted that the forest simply means the large area of land that's covered with trees and undergrowth.
In this case, it should be noted that a forest is an open system in terms of energy and that a forest is an open system.
Therefore, the correct options are C and D.
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