Apaleontologist finds a footprint with what looks like an opposable thumb. what type of animal is it most likely from? a. a primate other than a human c. homo habilis b. homo erectus d. australopithecines

the answer is b.  Homo erectus

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