How do red bone marrow and yellow bone marrow differ in function?

What are the four basic classes of organic molecules how do they differ structurally and functionally

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

What term describes a doctor who becomes a specialist by meeting standards beyond those of getting a license and passing a test in the specialty area?