* Starts with the Sun: The ultimate source of energy for almost all ecosystems is the sun.
* Producers: Plants, algae, and some bacteria capture sunlight and convert it into chemical energy through photosynthesis. These organisms are called producers.
* Consumers: Animals obtain energy by eating producers (herbivores) or other animals (carnivores). These organisms are called consumers.
* Decomposers: When organisms die, bacteria and fungi break down their remains, releasing nutrients back into the environment. These organisms are called decomposers.
* Energy Loss: Energy is lost as heat at each trophic level (producers, consumers, decomposers). This means that only a small amount of energy from the sun is actually passed on to higher trophic levels.
In summary:
* Sun → Producers → Consumers → Decomposers
This unidirectional flow of energy is a fundamental principle of ecology. It explains why there are limits to the number of trophic levels in an ecosystem, and why food webs are not infinitely long.
