A piece of wood that measures 3cm by 6cm by 4cm has a mass of 80g. What is the density of the wood?

the dark variety, as they are not visible on the dark tree barks

explanation:

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