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.
2. Respiratory System and Circulatory System. The circulatory system works well with the respiratory system to make sure that oxygen-rich blood can flow through your body. That is, your respiratory system supports your circulatory system with air or more specially oxygen which is sent to relative organs via arteries.