Describe the difference between cross sectional design and longitudinal design​

According to icd-10 official guidelines for coding and reporting section i.c.13.d. osteoporosis is a systematic condition, meaning that all bones of the musculoskeletal system are affected. therefore, site is not a component of the codes and you should use codes under which category?

The amount of oxygen that is actually used by the body during the rest or a hand workout is determined by the heart rate, the stroke volume, and the amount of a. blood circulating in the vascular system b. oxygen removed from the vascular system c. oxygen provided to the vascular system d. blood that individual has in the body e. hemoglobin in the red blood cells

What are the two things that all sociologists do in their studies?