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 respiratory system works with circulatory system. It supplies the body with oxygen and removes metabolic waste products. Oxygen is drawn into our body by breathing. Breathing is an involuntary action of the body which is controlled by the lower part of our brain called the medulla oblongata.