The energy-producing, or energy-storing, molecule is called

answer; polycythemia is the correct answer;

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 

d. organisms have cells with different shapes and functions.

a bird that nests only in a particular tree species.