Rank the following trophic examples lowest to highest in terms of likely trophic efficiencies. (In determining your answer consider the trophic efficiency between the top consumer and the most primary food source given in each example.) (A) A lake with large fish grazing on phytoplankton (B) A pasture with cattle grazing on grasses (C) Humans feeding on the fish grazing on phytoplankton in A (approximate FCR of the fish is 1 lb/lb) (D) Humans feeding on the cattle grazing on grasses in B (approximate FCR of the mammals is 7 lb/lb) B< A < C < D OD

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Energy Flow

Energy flow is the continuous and directional flow of energy through living beings within an ecosystem. All living beings can be segregated into producers and consumers. These producers and consumers can be further divided in a food chain. The term ‘trophic level’ is assigned to each level of the food chain.