Question

Out of unicellular and multicellular organisms, which one you expect to be more efficient? Give reason? Give two examples of both

Answer 1

Clearly, a unicellular organism is more energy efficient.
As the number of cells increases, it's average energy efficiency decreases. 

Unicellular Organisms ⇒ Amoeba, Plasmodium
Multicellular Organisms ⇒ Corals, Anemone