Energy flows through an ecosystem in a non-cyclic process, starting with the sun’s energy captured by producers through photosynthesis. Producers, such as plants, convert sunlight into chemical energy, which is then consumed by primary consumers. The energy is transferred through the food chain to secondary and tertiary consumers. Decomposers break down organic matter, releasing nutrients back into the environment. This unidirectional flow of energy ultimately sustains life and maintains ecological balance within the ecosystem.