In a mutualistic relationship between the legumes and Rhizobia, what will be the benefit gained by the legumes in exchange for carbohydrates and the protection they give to the Rhizobia?

• A. Rhizobia enhances water uptake
• B. Rhizobia enhances soil drainage
• C. Rhizobia gives usable nitrogen
• D. Rhizobia protect the plant from extreme temperatures

Answer: (C)