Write and solve an algebraic equation to find the original mass of a sample of the radioactive isotope uranium-235, which has a half-life if 704 million years. Your sample is about 700 million years old and has a mass of 120 g

a

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 

wegner's theory did not explain how the continents could move

explanation:

the answer is definitely a