Among the following biogeochemical cycles which one does not have losses due to respiration?

Option D is the correct answer.

• Respiration is the inhalation and exhalation of air to exchange oxygen for carbon dioxide.
• During the process, O₂  inhaled from the air is utilized, and CO₂ is produced as a by-product and released into the atmosphere. 
• Biogeochemical cycles involving phosphorus, nitrogen and sulphur do not have losses as they are not particularly involved in gaseous exchanges.