Ecologists have found that

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Ecologists have found that energy flows one way through ecosystems and requires external input. This is known as the first law of thermodynamics, which states that energy cannot be created or destroyed, only transferred or converted from one form to another. In ecosystems, energy enters as sunlight or chemical energy from inorganic compounds, and is transferred through the food chain. At each level of the food chain, some energy is lost as heat, leading to a unidirectional flow of energy through the ecosystem.

Ecologists Have Found That