Solutions For 9780131905429 Chapter 3 Problem 33A

Carbon cycle – by the process of decomposition, fire, or by respiration enters into the atmosphere.

Again enters into the organic compounds by the process of photosynthesis.

Nitrogen cycle – by the process of N – fixation, is converted to (atmospheric nitrogen to plant utilizable nitrate).

This organic nitrogen is converted into inorganic forms when it re-enters the biogeochemical cycle via decomposition.