7. At what structures in the lungs do the exchange of oxygen and carbon dioxide take place? A. Bronchi B. Alveoli C. Bronchioles D. Trachea
LA

Write a paragraph at least 10 sentences explaining how rocks are used today in society

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources?

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.