The diagram below models part of the nitrogen cycle. Use the diagram to answer any questions that follow. What happens to the nitrogen at W? a Its unusable form is converted into a form that is usable by bacteria in the soil. b Its usable form is inhaled and turned into proteins by the rabbit. c Its unusable form is directly transferred up the tree roots. d Its usable form is bonded with other molecules in the atmosphere.
Based on the given diagram, option a is the correct answer. At point W, nitrogen in its unusable form is converted into a form that is usable by bacteria in the soil. This process is known as nitrogen fixation.
Respiration has the greatest effect on which cycle? a phosphorus cycle b carbon cycle c nitrogen cycle d sulfur cycle
The correct answer is the carbon cycle. Respiration, which involves the exchange of carbon dioxide and oxygen during cellular metabolism in living organisms, has the greatest effect on the carbon cycle. During respiration, carbon dioxide is released into the atmosphere, affecting the balance of carbon in different reservoirs of the carbon cycle.
