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 (nitrogen cycle, water cycle, carbon cycle) where elements are continuously recycled through ecosystems. Sodium does not have a complete biological cycle - it accumulates primarily in oceans and is part of mineral sedimentation cycles but not actively recycled like the other three.

Keep practicing — related questions