"An organism transfers its energy back and forth between trophic levels" which signifies that energy is not really lost. So, the correct option is D.
What do you mean by Trophic levels?
Trophic levels may be defined as the sequence of organisms' positions in a particular ecosystem.
During the process of energy transfer between trophic levels, energy would never be lost, but it is delocalized to other organisms through food.
Therefore, the statement that explains why energy is not really lost is an organism transfers its energy back and forth between trophic levels.
To learn more about Trophic levels, refer to the link:
https://brainly.com/question/1236573
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