Select the correct answer. During which stage of fetal development do the heart and lungs of a fetus become fully developed and functional? A. first trimester B. second trimester C. fertilization D. third trimester

B the second trimester

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 

answer; benefit; harmed;