High levels of in the blood are associated with lower risk of cardiovascular disease.

The answer is High-density lipoprotein or HDL. One of the critical elements of HDL is to transport cholesterol from the cells and tissue back to the liver. High HDL-cholesterol is great as it removes cholesterol from cells and the blood and averts overabundance cholesterol. HDL likewise expels cholesterol stored in the dividers of veins.

When scientist examine data such as historical documents, they are using the "scientific methods"