Inability to control variables
Answer is….drumroll please A
Answer: Decreases
Explanation: The amount of energy decreases as we move up in the tropic level.
The maximum energy can be seen in the the producers and then at each tropic level only 10% of the energy is transferred to another level.
Here, the matter increases increases as we move up from producers towards consumers. The energy decreases at each level as compared to the previous level.