If you could not find an organism for a trophy level, suggest an organism that would fit

equal distribution i think.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.