What is the function of the cell membrane, in all living organisms?

It regulates what enters and leaves the cell.

Explanation: The cell membrane is semi-permeable, meaning it selects what is allowed in the cell and what can leave the cell. The phospholipid bilayer is responsible for allowing small substances to pass through, like oxygen and CO2

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