During which year was the population of the united states about 150,000,000? a. 1930 b. 1940 c. 1950 d. 1960

The correct answer is "C.) 1950"

i think that c)gold was found there

but i am not sure

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