Microorganisms play a vital role in recycling chemical elements such as phosphorus and nitrogen
Microorganisms break down dead organic matter and convert chemical elements into forms that living organisms can reuse. Without them, essential elements like nitrogen and phosphorus would stay locked in dead material forever.
Real World
The Great Barrier Reef depends on nitrogen-fixing cyanobacteria to supply usable nitrogen in nutrient-poor tropical waters, supporting the entire coral ecosystem's food web.
Exam Focus
If asked to 'explain' recycling, link microorganisms to specific conversions (e.g. proteins → NH₄⁺ → NO₃⁻), not just 'breaking down'.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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