Correct Answer: A
Solution :[a] In every ecosystem, only producers have the capacity to use the energy from the sun and convert it into food. The energy in the form of food get transferred form one trophic level to another. Thus, the flow of, energy is always unidirectional. The amount of energy that reaches the next trophic level is lesser than earlier trophic level. Therefore, the amount of energy decreases with each higher trophic level. Thus such a pyramid would be straight or upright in all the ecosystems.
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