Truly modern molecular biology emerged with the uncovering of the structure of DNA in the 1960s and concurrent advances in biochemistry and genetics. Molecular biology is one of three primary molecular-scale biological sciences, the others being biochemistry and genetics.
1 Students should know the parts and functions of the circulatory and respiratory systems and how they work together for respiration. 2  Students should also understand what homeostasis is and that all living things must be able to maintain homeostasis.
The lungs are two organs that pass oxygen into every red blood cell carried through their capillaries; a major organ of the respiratory system, where the exchange of oxygen and carbon dioxide in the bloodstream takes place; expands to suck in air and shrinks to squeeze air out.