In an ecosystem, the LEAST efficient energy transfer link is from

The LEAST efficient energy transfer link in an ecosystem is from the secondary consumers to decomposers. This is because secondary consumers, such as carnivores, receive only a small fraction of the energy that their prey originally obtained from the producers (plants or algae). This is due to the fact that energy is lost at each step of the food chain through processes such as respiration, movement, and waste production. When secondary consumers are consumed by decomposers, even less energy is transferred due to the fact that the energy in their bodies has already been used and broken down. Therefore, this link in the food chain is the least efficient in terms of energy transfer.