Multiple choice

Which of the following components is not recycled in nature?

  1. Nitrogen

  2. Water

  3. Sodium

  4. Carbon

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitrogen, water, and carbon all have complete biogeochemical cycles in nature where they are continuously recycled through the atmosphere, organisms, and environment. Sodium does not have a significant cycle - it enters ecosystems through weathering of rocks but doesn't recycle in the same continuous way as the major biogeochemical cycles.

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