David is a 60-year-old smoker that has developed emphysema. This condition affects the lungs and prevents them from exchanging carbon dioxide and oxygen. Specifically, oxygen cannot move from a high to low concentration in the lungs because the lungs are damaged.

What element is able to combine with itself and hydrogen to form large molecules ?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

Which statement best describes the role of religion and culture in ancient medicine?