In ecological systems, energy transfer between trophic levels is inefficient, with approximately 90% of energy lost primarily as heat during metabolic processes. Producers, such as plants, convert sunlight into energy through photosynthesis, but a significant portion is used for growth, reproduction, and maintenance. When primary consumers, like herbivores, consume producers, they only absorb about 10% of the energy stored in them. The rest is dissipated as heat due to cellular respiration and other biological functions, leading to a low percentage of energy transfer from producers to consumers.