The biggest difference between the flow of energy and the flow of chemical nutrients in an ecosystem is that __________.

• A. the amount of energy is much greater than the amount of nutrients
• B. energy is recycled but nutrients are not
• C. organisms always need nutrients but they don't always need energy
• D. organisms always need energy but they don't always need nutrients
• E. nutrients are recycled but energy is not

Answer: (E)

Verified step by step guidance

1. Understand the basic concepts: In an ecosystem, energy flows in one direction, typically from the sun to producers and then to consumers, and is eventually lost as heat. In contrast, chemical nutrients cycle within the ecosystem.
2. Identify the key difference: Energy is not recycled in an ecosystem. It enters as sunlight and exits as heat, whereas nutrients are recycled through various processes such as decomposition and nutrient uptake by plants.
3. Consider the role of organisms: All organisms require both energy and nutrients to survive. Energy is needed for metabolic processes, while nutrients are essential for growth and maintenance.
4. Evaluate the options: The statement 'nutrients are recycled but energy is not' correctly describes the fundamental difference between energy flow and nutrient cycling in ecosystems.
5. Conclude with the correct understanding: The flow of energy is linear and non-recyclable, while the flow of nutrients is cyclical and involves recycling within the ecosystem.