the duck-billed platypus is quite an unusual mammal. use credible websites to research the duck-billed platypus. why is it unusual compared to other mammals? why is it classified as a mammal?

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