the heart-lung machine is used so that surgeons can operate on the arteries supplying heart muscle. these arteries may be diseases. name these arteries and explain how they may become diseased​

What is the importance of having the us forest service, the bureau of land management, the us fish and wildlife service, and the national park service? to manage land resources for conservation and the development of natural resources to manage land resources for conservation and the development of urban areas to preserve historical landmarks and manage the development of urban areas to preserve historical landmarks and manage the development of rural areas