Darwin’s finches evolved on an island. What is the main reason that islands often provide good examples of evolution? They have many niches.
They have many organisms that live on them.
They allow for automatic biogeographic isolation.
They allow for many variations to exist in species.

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