Final answer:
An energy pyramid for the given food web includes the grass, grasshopper, frog, and owl.
Step-by-step explanation:
An energy pyramid illustrates the flow of energy through different levels in a food web. In this food web, the grass is at the bottom and represents the primary producers. The grasshopper consumes the grass and is an herbivore, representing the primary consumer. The frog eats the grasshopper and is a secondary consumer. The owl preys on the frog and is a tertiary consumer. The aspen, rabbit, and snake are not part of the food chain and should not be included in the energy pyramid.
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