Final answer:
The predominant cause of pregnancy-related mortality is hemorrhage, with hypertension and diabetes being significant risk factors for health complications.
Step-by-step explanation:
The most common cause of pregnancy-related mortality is hemorrhage. Although factors such as hypertension and diabetes greatly increase the risk for various health complications, when it comes to pregnancy-related deaths, excessive bleeding is the predominant issue. This is a critical global health concern, and efforts continue to be made to reduce such mortality through improved prenatal care and emergency obstetric services.