Answer:
100kcal
Explanation:
The law in energy transfer in the food chain is that only 10% of total energy is transferred.
The food chain between the plankton and starfish follows;
Plankton - Mussels and Oysters - Starfishes - Manta Ray
Plankton being the producer produces 100,000kcal
Mussels/Oysters get 10% of 100,000kcal= 10,000kcal.
Starfish gets 10% of 10,000kcal = 1,000kcal
Manta Ray being the final consumer of starfish gets 10% of 1,000kcal = 100kcal
