Need help on cholesterol Problem?

Number one I can not help you with but number 2 is because most animals do not live long enough to develop heart disease. You have to remember that the life expectancy has doubled in the last 500 years and has increased from 48 years to over 70 in the last 100 years. In the third question I would say that there is not enough information to say for sure. Doctors really don't know what causes heart disease and they treat the symptoms not the cause. They know that it is caused mostly by inflammation of the blood vessel but not why. Cholesterol is not the problem either. 50% of people who die from heart disease have normal cholesterol levels. So the real answer is the doctors are still trying to figure it out and in the mean time they treat what they can and adjust once new understanding come out.