Which is NOT a characteristic of all vertebrates? a backbone
an exoskeleton
paired appendages
a well-developed brain protected by a skull

b is the best answer for this question.

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