Which statement best describes the difference between myoglobin and hemoglobin Hill plots?

• A. Myoglobin has three distinct regions, while hemoglobin has a single line with a slope of 1.
• B. Hemoglobin has a single line with a slope of 3, while myoglobin has three distinct regions.
• C. Both myoglobin and hemoglobin have a single line with a slope of 1.
• D. Myoglobin has a single line with a slope of 1, while hemoglobin has three distinct regions with varying slopes.

Answer: (D)