The total amount of energy entering a food chain is that which is present in the

The total amount of energy entering a food chain is that which is present in the producer. Producers are the organisms that convert energy from the sun, through the process of photosynthesis, into organic molecules that can be used as food by other organisms. As a result, they are the source of all energy in an ecosystem. When a herbivore eats a producer, it obtains some of the energy that was stored in the producer's organic molecules. When a carnivore eats an herbivore, it obtains some of the energy that was stored in the herbivore's body. The amount of energy that is passed from one organism to another in a food chain is always less than the amount that was present in the previous organism, as some of the energy is lost as heat or used for metabolic processes. Therefore, the total amount of energy available to all organisms in a food chain is that which was originally present in the producer. Without producers, there would be no energy available for other organisms to survive and thrive.