In active transport, molecules are moved across the cell membrane with the help of: A) neurons
C) proteins
D) inhibitors
(B was electrical impulses but it was wrong)

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