Energy is traveled from one trophic level to the next through food. So the correct answer is I.
The trophic level of a living being is the place it settles in a food web. The trophic level of a living thing is the number of phases it is from the start of the chain.
A food web begins at trophic level 1 with basal producers such as plants, can move to herbivores at level 2, carnivores at level 3 or higher, and generally end with height wolves at level 4 or 5.
Therefore, option A is correct.
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