Setting aside the notion of determining the number of individual animals on the planet for a moment, merely determining the number of species on the Earth is challenging. Science has only been able to offer estimates thus far, and totals vary greatly.
People who have early onset Alzheimer's may be in any stage of dementia â early stage, middle stage or late stage. The disease affects each person differently and symptoms will vary. If you are experiencing memory problems: 1  Have a comprehensive medical evaluation with a doctor who specializes in Alzheimer's disease.
The most common type of heart disease in the United States is coronary artery disease, which affects the blood flow to the heart and can cause a heart attack.The term heart disease refers to several types of heart conditions.The most common type of heart disease in the United States is coronary artery disease, which affects the blood flow to the heart. Decreased blood flow can cause a heart attack.Learn more about heart disease, heart attack, and related conditions: 1  Coronary Artery Disease. 2  Heart Attack.he most common type of heart disease in the United States is coronary artery disease, which affects the blood flow to the heart. Decreased blood flow can cause a heart attack. Learn more about heart disease, heart attack, and related conditions: